Smoking causes impotence by restricting circulation. Erections depend on blood flowing into the delicate arteries of the penis and filling the erectile tissue. When blood flow is inadequate, erections cannot occur.
Optimum female sexual pleasure also depends upon adequate blood flow to the genital region. Like the penis, the clitoris and vagina become engorged with blood during arousal. Smoking creates an imbalance in hormone levels and thereby interferes with normal menstrual cycles, as well. Female smokers have a higher prevalence of irregular or infrequent menstrual cycles and early menopause than nonsmokers do.
If you smoke, here's a great incentive to finally kick the habit - your sexual fitness depends upon your quitting. Regardless of whether you are old or young, male or female, a recent smoker or a lifetime addict, your sexual vitality and overall health will improve when you quit. You will feel better, look better, taste and smell better to your lover, appear more attractive, and enjoy better sex.