I titled this so you would look at it...it's important for your health. Susan talked about reaching youngsters before they have problems so here goes.
This is something I always wondered about. I was going to write this UK study up that I found, highlighting important facts, but you might as well read it for yourself. For all those interested, look and see what the profound effects of smoking have on sex, an unborn fetus, cancer, erectile dysfunction and more...it's astounding and will blow you away with all with medical references supporting the facts.
I figure that, each of you interested in sex, fall into 2 categories.. you are about to indulge in or you already enjoy sex. In any case, you will think carefully about ever picking up a cigarette! It's something I never knew. Hey...look at it this way...I could have done you a big favor. Cut and paste this address...tell your friends who should know.
http://www.ash.org.uk/html/factsheets/html/fact07.html

Absolutely right! Read for yourself! Thanks!
Susan

Ok - here's some bits of this.......

Male sexual impotence
Impotence, or penile erectile dysfuntion, is the repeated inability to have or maintain an erection. One US study of men between the ages of 31 and 49 showed a 50% increase in the risk of impotence among smokers compared with men who had never smoked. [6]  A meta-analysis of studies published since 1980 found that 40% of impotent men were current smokers compared with 28% of men in the general population.

Fertility
Women who smoke may have reduced fertility.  One study found that 38% of non-smokers conceived in their first cycle compared with 28% of smokers.  Smokers were 3.4 times more likely than non-smokers to have taken more than one year to conceive.  It was estimated that the fertility of smoking women was 72% that of non-smokers.

Smoking and oral contraceptives (birth control pills)
For younger women, smoking and the use of oral contraceptives increases the risk of a heart attack, stroke or other cardiovascular disease by tenfold.  This effect is even more marked in women over 45. [9]  It is therefore important that all women who take the contraceptive pill be advised not to smoke.

Smoking and cervical cancer
Epidemiological studies have found that women who smoke have up to four times higher risk of developing cervical cancer than non-smokers and that the risk increases with duration of smoking. Studies have demonstrated biochemical evidence that smoking is a causal factor in cervical cancer