Drug use/Alcohol
Anabolic steroids taken to stimulate muscle strength and growth can cause the testicles to shrink and sperm production to decrease. Use of cocaine or marijuana might reduce the number and quality of your sperm as well. Alcohol can lower testosterone levels and cause decreased sperm production.
Occupation
Certain occupations might be linked with a risk of infertility, including welding or those associated with prolonged sitting, such as truck driving. However, the data to support these associations are inconsistent.
Lifestyle
Men who smoke might have a lower sperm count than those who don’t smoke.
Also, obesity can impair fertility in several ways, including directly impacting sperm and by causing hormone changes.
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