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Smoking cigarettes or marijuana can affect a man’s fertility.

A number of studies have documented the negative impact of nicotine and marijuana on sperm count and production. For example, male smokers’ sperm density (the concentration of spermatozoa in the semen) and motility (ability to move towards the egg) is considerably lower than that of nonsmokers’. There is also increased occurrence of abnormal sperm. All of these can impact fertility.

Smoking cigarettes or marijuana can also impact sex drive and virility. Impotence, or erectile dysfunction (inability to achieve or maintain an erection) may be linked with cigarette smoking or marijuana use. In this case, smoking can result in reduced blood flow to the penis, resulting in “vascular impotence”.

If you’re a smoker, or have smoked in the past, and are concerned about your fertility, you may want to have your fertility tested. See our section on testing. If you have a low sperm count, see our question on this topic in our Assisted Reproduction section.


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