Study: Men who've smoked marijuana are more fertile than those who haven't

They expected cannabis to have a detrimental effect on sperm count and fertility. Instead, those participants who admitted ever taking the drug turned out to have higher sperm counts than non-users.

The finding does not necessarily mean that smoking cannabis increases the chances of fatherhood, the study authors and other experts were quick to point out.

They suggest that the association may not show any cause-and effect relationship, but rather reflect the influence of the male hormone, testosterone, on both sperm count and risk-taking behavior, such as smoking cannabis.