Nonatherosclerotic vascular changes may also mediate the effect of smoking on genital function. The vasoconstrictive effects of nicotine in cigarette smohe may impair the complicated vascular processes involved in erection (Benowitz 198X). This may be due in part to disturbances of prostaglandin production in the vascular endothelium or to an enhancement of platelet aggregation noted by several investigators (Nadler. Velasco. Horton 1983; Alster et al. 1986: Taylor et al. 19X7: Lassila et al. 198X: Jeremy et al. 1986: FitzGerald. Oates, Nowak 1 Y8X: Chapter 6). Finally. hormonal effects of cigarette smoking could alter sexual responsiveness and spermatogenesis. Alterations in the secretion of luteiniring hormone releahing hor- mone (Moss, Riskind. Dudley 1979) or catecholamine\ (Patra. Sanyo]. Biswas IY79: Klaiber and Broverman 1988) are two such possibilities. but disturbances in sex hormones. particularly low testosterone or high estradiol. have been suggested more often. In general. men who smoke cigarettes have similar or higher testosterone level\ than nonsmokers: thus. it is difficult to associate low testosterone with sexual dysfunc- tion among men who smoke (Briggs 1973: Shaarawy and Mahmoud 1982: Andersen. Semczuk. Tabor 1984; Handelsman et al. 1984: Deslypere and Vermeulen 1984; Vermeulen and Deslypere 1985: Vogt, Heller. Borelli 1986: Barrett-Connor and Khaw 1987; Dai et al. 1988: Lichtenstein et al. 1987; Meikle et al. 19x7: Klaiber and Broverman 1988). The adrenal androgens (i.e.. androstenedione. dehydroepiandrosterone. and dehydroepiandrosterone sulfate) are elevated in male smokers (Barrett-Connor. Khaw. Yen 1986; Barrett-Connor and Khaw 1987; Dai et al. 1988). Aromatization of these hormones may explain the elevated levels of estradiol among males who currently smoke (Entrican. Mackie. Douglas 1978: Lindholm et al. 1982; Klaiber, Broverman, Dalen 1984: Barrett-Connor and Khan 1987; Lichtenstein et al. 1987: Dai et al. 1988; Klaiber and Broverman lYX8). Elevations in circulating estrogens may interfere with spermatogenesis and sexual behavior (Klaiber and Brover- man 1988); such an explanation remains speculative. Several studies have suggested that the estradiol and testosterone levels of former smokers are comparable with those of never smokers (Deslypere and Vermeulen 1984: Vogt, Heller, Borelli 1986; Barrett-Connor and Khaw 1987; Lichtenstein et al. 1987). This observation implies that smoking cessation is likely to reverse any effect mediated by disturbances of these hormones. Alternatively, former smokers may have had a lower total dose. Androstenedione and dehydroepiandrosterone sulfate levels may be modestly higher in former smokers compared with those of never smokers (Barrett- Connor. Khaw, Yen 1986; Barrett-Connor and Khaw 1987: Lichtenstein et al. 1987). However, the relevance of these findings to sexual capabilities is unlikely to be significant. These hormones appear to have little intrinsic potency, and are important because of their capacity for conversion to more active hormones such as testosterone and estradiol (Baxter and Tyrrell 1987). Sexual Activity and Performance Surveys of the relationship between smokin p and frequency of sexual episodes (intercourse or masturbation) have generally found smokers to be as sexually active as nonsmokers. In two studies of elderly men. sexual activity in smokers was comparable / with that of nonsmokers (Tjitouras. Martin, Harman IYX?: Diokno. Brown. Herzog 1990): in a cross-sectional study of younger men. no difference\ were indicated (Vogt. Heller. Borelli lY86). Adolescent smohers are more sexually active than nonsmokers (Russell I97 I: Malcolm and Shephard 197X ). In contrast. Cendron and Vallery-Mas- son (IY71 ). in study,ing 70 men older than age 45. found that those who reported smoking between ages 25 to 40 al\o reported being less sexually active at those ages than those who denied smoking. Ovrerall. it appean that the relation between current cigarette smoking and the level of male sexual activity is not very strong. Among younger males. personality differences between smokers and nonsmokers may dominate any adverse physiologic effects (Russell 197 I ). If. as the aforementioned studies suggest, current smokers (or ever smokers) are similar in sexual habits to never smokers, then no differences would be expected for former smokers. Vogt, Heller. and Borelli (19X6) evaluated 239 healthy male volun- teers aged 19 to 30 without genital abnormalities or diseases and taking no medications. The study results indicated that the 36 former smokers among them were comparable with both never smokers and current smokers in sexual activity (Vogt. Heller. Borelli 1986). Impotence. the inability to maintain an erection sufficient for intercourse. has been more extensively investigated in relation to smoking. Among treated hypertensives aged 40 to 64. cigarette smoker3 were more likely to report impotence. although the differences were modest and not statistically significant (Biihler et al. IYXX). A statistically significant association was reported among men undergoing radiation therapy for prostatic cancer (Goldstein et al. 1983). However. in both studies. poten- tially important covariates. such as alcohol intake and age. M#ere not considered. Two other studies of men undergoing impotence evaluation indicated a high prev*alence ot smoking and suggested an association between smoking with impotence (Virag. Bouilly. Frydman 1985: Condra et al. IYXh). Unfortunately. neither study included a sexually functional control group. and both studie\ based their conclusions on ques- tionable comparisons ot`the smohing rate in their clinic patients with that of the general population. Vopt. Heller. and Borelli (1986) studied a group of young volunteers vvithout selecting for impotence. These investigators found that smokers reported more difficulties with decrea& libido and erection than nonsmokers (Vogt. Heller. Borelli 19X6). This analysis did not consider former smokers separately. An acute effect ofsmohing on sexual performance is suggested by a study of smokers monitored while viewing erotic films (Gilbert. Hagen. D'.Agostino IYX6). The succes- sive smoking of 2 cigarette\ high in nicotine content significantly impaired the rate of penile diameter change compared with that observed after smoking I cigarette or eating candy. Hovvever. the clinical relevance ofthese oh\enation\ is unhnoan hecauke franh impotence has not studied. An important clinical measurement in the evaluation of impotence is the PBI. v.hich indicates the \y stolic blood pressure in the penis div,ided by systolic blood pres\urc in the arm. A low \,alue i\ considered to be ev idcnce of compromise of the penile blood apply. a factor v+ hich may interfere v+ ith erection. Several \tudie\ of men undergoing evaluation of impotence reported an association between smohing and Ioh PBI (Jacobs et al. IYX3: Condra et al. 1986: Bornman and Du Ples\i\ lYX6: DePulma et al. IYX7). Among impotent diabetics, evidence of nocturnal erections wJas found less in smokers compared with nonsmokers. thus suggesting an increased risk of vascular compromise in smokers (Takahashi and Hirata 1988). However. other studies of impotent men have not reported differences between smokers and nonsmokers in vascular measurements (Wabrek et al. 1983; Virag, Bouilly. Frydman 1985: Kaiser et al. 1988). Most of these investigations did not consider covariates such as alcohol use, although one study suggested that smoking in isolation had little effect and that an association of smoking with an abnormal PBI may be due to the association of smohing with other arterial rish factors (Virag. Bouilly, Frydman 1985). In many of the studies relating smoking and impotence. the investigators did not distinquish nonsmokers as ex-smokers or never smokers. However. two investigations considered former smokers separately (Table 15). Wabrek and associates (1983) studied I20 men who were referred to a hospital-based erectile dysfunction program. The percentage of former smokers vvas approximately the same among men with impaired, borderline. and normal PBI. Condra and colleagues ( 1986) reported on I78 patients also referred for impotence. Former smokers were not separated for analysis. but this study suggests that the PBI for ex-smokers is more normal than in current smokers (Condraet al. lY86). However. neither study considered important covariates. such as age and alcohol use (Wabrek et al. 1983: Condra et al. 1986). Two recent investigations considered the effect of smoking cessation on impotence. Forsberg and colleagues (1979) noted that two smoking men who were impotent improved their functioning after smoking cessation at the same time that measures of penile blood flow improved. However. it is not clear how these two men were selected for this study. and control subjects were lacking. Elist. Jarman. and Edson (1984) reported on the treatment of 60 impotent men. Twenty nonsmoker\ were treated with the vasodilator isoxsuprine. and 40 smokers were either advised to stop smoking or advised to stop smoking and also given isoxsuprine. There was no mention of randomization. and there was no untreated control group. Similar proportions im- proved whether given isoxsuprine. convinced to stop smoking. or both (Elist. Jarman. Edson 1984). Animal data have not elucidated the relation between smoking and either sexual activity or impotence. Soulairac and Soulairac (1972) studied the sexual activity of male rats given either a 0.6 mg/kg or a 1.2 mg/kg dose of nicotine subcutaneously. The sexual activity of the rats after the nicotine administration was compared with that before treatment. Sexual activity was markedly increased with the 0.6 mg/kg dose. and at 1.2 mg/kg there was trembling and twitching and no sexual behavior for 2 to 3 hours. In contrast, exposure to smoke from 1 cigarette has been shown to interfere with the physiology of erection in male dogs (Juenemann et al. 1987). In summary, the level of sexual activity does not appear to be affected by cigarette smoking. Cigarette smoking may be associated with impaired male sexual perfor- mance. Among impotent men, smokers are more likely to have an underlying vascular problem. These associations have been more commonly noted in groups already at high risk of impotence. such as hypertensives and diabetics. However. these associations have not been consistently observed, and the positive findings may be due to the association of smoking with other factors such as alcohol use. Moreover. because the 303 TABLE IS.-Sexual performance among male former smokers studies of PBI are generated entirel) in referral populations. it i\ unclear if these finding\ can be generalired. Because of limited and uncontrolled data. no conclusion\ can be drawn regarding WYLI~I performance or PBI among former makers. Sperm Densit- and Qualit> Measul-ements of sperm den\it!. mr)rpholog . and motilif arc commonI>, uxd assessmcntk of sperm qualit! (Roger\ and Ru\\ell IYX7 I. O\er 20 \tudie\ hare dealt with the relation of cigarette \mohing to sperm den\it!,. motility. and morpholog> (Vicxian lY6Xa: Schirren and Gt'! 1960: Cm~phcll md Harrison lY7Y: Vogel. Braver- man. Klaiber lY7Y: Stehhun IYXO: Nebe and Schirrcn IYXO: EVXII\ t't al. I98 I: Godfre! 19X1: Roclrisuc/-Rigau. Smith. Steinherger IYXI: Shaaraw! and hlahmoud IYX2: Buiatti et al. I YX4: Andervx. Semc/uh. Tabor I YX4: Norden\on. Xbrams\on. Ducheh 19X3: Handcl\man et al. IYX-I: Hoda\ et al. IYX5: Kulihausk. Bluustein. Ahlin IYXS: Ablin IYXh: Rantala and Ko\himie\ lYX7: Vast. Heller. Borelli lYX6: Klaiber et al. lYX7: Dihshit. Buch. Jlansuri lYX7: Sxrrunen et al. IYX7: Klaiberand Bro\erman IYXX: Svaranen et al. I9XY: Rui. Oldereid. Purvi\ IYXY: klar\hburn. Sloan. Hammond IYXY: Oldereid et al. I YXY). Table I6 `rummari/es the finding\ of those studie\ that reported mean values for maker\ and nonsmohcrx In mo\t \tudie\. men smohing cigarette\ had lower sperm Jen\it>. although many ofthe\e \tudie\ indicated differences that \+ere not \tati\tically riynificant. The \moher\' a\`erage sperm density uxs at lea\t X0 percent that of the nonsmohers. In ~\cral studies sperm morphology or motility L\;LS impaired in smokers compared with nonsmokers. but this was a less consistent findincg. Few studies have considered the spermatic chromosomal characteristics of smokers com- pared with nonsmokers. Nordenson. Abramsson. and Ducheh ( 1983) found smokers to have more chromosome breaks than nonsmokers. but Oldereid and couorkers ( I YXY) reported no difference5 in DNA condensation as assessed by flow cytometr\`. Although differences in mean values of any of these measurements suggest an effect of smoking. the most relevant parameter may be the percentage of smokers and nonsmokers who exhibit deficiencies in sperm densit). morpholog\,. or motility. Several researchers have investigated the relative risk ofa/oospermia (no sperm in the ejaculate) or oligospermia (reduced number of sperm) in smokers versus nonsmokers or never smokers (Table 17). Although the ranpe of relative rishs is uide. there is a clear pattern of increased risk among smokers. However. the clinical significance ot oligospermia is uncertain. Most studies have used one cjvculate per man. although the within-man coefficient of variation can be a\ much a\ 60 percent (Schenker et al. 1 YXX ). The available information suggests that current smohins is related to IOU sperm density. However. these data are limited. Many studies investigated men visiting infertility clinics. limiting generalization. Moreover. if male makers with poor sperm quality are most likely to attend these clinics. selection biases may distort the results. Also. many of these studies were relatively informal. Few of the studies accounted for potentially confounding factors such as alcohol use and age. Less than half of the studies documented that a period of sexual abstinence was required for subjects before giving the sperm sample, and few of the studies anstyLed multiple semen specimens as some authorities recommend (Zaneveld and Jeyendran 1988). Most studies have a small number of subjects. and their statistical pouer is limited for this reason. In come of the studies. it is not clear whether former smokers u'ere included in the smoker or nonsmoker group. A few studies investigated ex-smokers (Table IX). One M;IS a case-control stud!, of male infertility in Italy (Buiatti et al. 1984). The cases were a/.oospermic or oiigosper- mic men being treated for infertility at the University of Florence. Controls were University outpatients who had normal sperm counts. There were no significant differences between smoking categories in the percentage of men with Iov. sperm counts. Vogt. Heller. and Borelli (1986) e\,aluated 139 male volunteers. Among former smokers (those who had smoked for at least I year and those who had stopped smoking for at least 1 year). percent normal spermatozoa. percent young forms. percent old forms. and percent degenerate forms were comparable with those of never smokers. Stekhun ( 1980) reported that 42 percent of former smokers had oligospermia compared with I8 percent of never smokers. Schirren and Gel ( 1969) reported that three men with low sperm density and motility showed substantial increases in these parameters 3 to 6 months after smoking cessation. However. there w'erc no control\ defined in this analysis. Because of the limitations of the four studies. no conclusions are possible regarding the effects of smoking cessation on sperm quality in humans. Animal studies have not been particularly informative. In some studies. rodent\ that were heavily exposed to nicotine or cigarette smoke demonstrated testicular atroph!,. but this has not been a general finding (Larson. Haag. Silvette I96 I ; Larson and Silycttc IY6X: Dontenuill et al. lY73b: Essenbq. Fagan. Maler\tein lY.5 I: Thienes IYhO: TABLE 16.-Sperm quality among smokers and nonsmokers Vtcfian I IYhXa, Vogel. Broverman. Klather I IY7YI Nebe and Schlrren I 19x0) Evatx er al (1981) Spira et 31. (I')XI) Rodrtguw-Rteau. Smith. Stetnkryzr (19x7) Andrr\ett. Semcuh Tahor ( I 0X-l I Handel\man et 31. (IYXI) Kulihaukt\. Blaustem. Ahlin i 1985) Rantala and Kokimie\ (10X7) Vogt. Heller. Borellt lnlerttltt! clmtc (71175 1 Volttntwr~ 1 `O/2 I Inferttltt\ cltmc (Xhili7, Semen donor\ (7 I12 3 / Frrttltt) clmic (1351107, Volunteer\ 0.x7 O.ho" I .Ol (1.75" 0.X6 O.Y5 O.Y3 O.YY 0 67 0.43" (I.40 0.x IJ 1).40 lS O.Y7" 0.Y-t O.YJ 0.') I" I (WI 0 h4" I .07 0 YX I .ot) 0.0x I .Ol I) 77 0.x7" O.Y.7~' O.Y)i I .(Hl O.h7" LOX 0.03" 0.7x" O.Y5 0,YY Smohrr\ and non\moLrr~ marched on qxm den\tl) OItgoqwrmtc* men omttted ( may depend on the duration and dose ofexpo~re. a\ well :I\ on the age\ at u hich exposure take\ place. Morco\,er. the relevance to humal> of the large don\ yi\cn to the animals k uncc`rtain. None ofthehe investigation\ considcrcd \pt'rmatogenc\is at'ter exposure ended: thu4. feu conclusion\ may he draun rt,` ~vrding the t'i'fcct of ct's\ation ofcspo~re even within the limitation\ of lhe animal \Iuclie\. TABLE 17.~-Estimated relative risk of azoospermia or oligospermia among smokers versus nonsmokers or never smokers Reference Study population tnumher of non\moher\, number of \moher\) Contra\t Estimated relattve rthk tn \moher\ Comments Schirren and Ge) Andrology clmlc (IYhYl lsxo/ll77l Campbell and Fertility clmic Harrlwn t I Y7Y I (I 19/13-i, Stehhun Uot stated (?3/1051 I IYXII) Rodrtg~r/-Rtyu. Frrtilitk cllnlc Smith. Stetnherger t 101/5X1 I lYX21 Buwtl et 31. Fertillt\ cltmc (14X-I) ,xo;l.G~ Andrr\en. Srmc/uh. T`lhor~ IYX1, ,Ahiln 1 IQXh) l'og. Heller. B~Wlll (14X6) FenlIlt> clonic lX61l-l7) uot \tatwi 1 I .7S/`2iX, Volunteer\ 1.53150, A/oo\permta: \moher\ v\. nonhmohrrs Oligoywmia: \mohen \ `1. non\mohers Ollgo\permta: current \mohrr\ ~5. nexer \mokrr\ OItgo\permta: I<20 x IOh/mLI: current smokers VI. non\mohrr\ Oligoyxrmta (tac)clm formation in human endocxdium 111 \,itr-o. (;c,/rc,c.ci/ /`/ttr~-~~wc o/oy) 170 ):-II I -- 113. 19X6. ALWACHI. S.N.. AL-KOBAISI. M.F.. MAHMOUD. F..1.. Z.AHlD. %.R. Po\\~hlc &`t'cct (It nicotme on the cpermatogene& and wticular activit! of the mature m;tlc ;tlhinc) m~cc. .lof/rnu/ of`Ri/h~ic~o/ S(,iC'f7C c Ke.\eor-(~/r I7(.? 1: I x5- I Y-t. I YX6. ANDERSEh'. A.N.. SEMCZLIK. M.. TABOR. A. Prolacttn and pituita~!-~oliatial ~UIKIIOII 111 cigarette wiokinp infertile patients. .fi\,rcl/-o/,~:iri I h(5 ):iY I -3Y6. I YX4. ANDERSEN. F.S.. TRANSBOL. 1.. CHRISTIANSEN. C. I\ cigarette zmohlnf ;I PI-omotcr 01 the menopau4 Am Mrdiur SC trmliutr~~ic 0 Z 11: I .37-I ?Y. I YX2. ANDERSON. G.D.. BLIDNER. I.N.. MCCLEMONT. S.. SINCLAIR. J.C. Dctt`mlln:lnt\ 01 \ize at birth in a Canadian population. A~wr-ic (,,I ./o//r-~/c/i rd Oh.\rc/~-~( .\ 0/1t/ c;\ I,(`( o/r):)\. I SO13 ):236-231, October 1. 1983. ANDERSSON. K.. ENEROTH. P.. FUXE. K.. H&RFSTRAND. A. Eftcct\ofacutc rntcrmittcnt c\,liJrure to ciparette mohe on h> pothalamic and preoptic catecholamine nerve tcrmin:ll \>+zrn\ and on neuroendocrine funclion in the dle\trou\ 1x1. `\/r/i;\~c~\ ,lj. P /ro/~fl/~,c ill/,:`\ 337:131-13'). 19X8. ANDERSSON. K.. FUXE. K.. ENEROTH. P.. AGVATI. L. Differential effect\ 01 mecamylxnine on the nicotine induced chan?cs in amine level\ and turnover in h! poth;llamlc dopamine and noradrenaline nerve terminal hytem\ and in the secretion ofadenohypoph! \c';II hormone5 in the castrated female rat. Evidence for involvement of cholinrryic nicotuwllhe receptor\. Ai,ra Ph~.vio/o,qit.tr S~,c/,lt/i/,a~,ita I20:4XY--IYX. I Y83. ANDERSSON. K.. FUXE. K.. ENEROTH. P.. GUSTAFSSON. J.-A.. AGNATI. L.F. 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Modem assessment of semen for diagnostic pur- poses. .Samirzar..r i/r Reprochrc~ri~~e E,~rloc,r.i/lo/o~~ 6(4):123-336. 198X. CHAPTER 9 SMOKING, SMOKING CESSATION, AND OTHER NONMALIGNANT DISEASES