Does Marijuana Affect Sperm Count?

Harvard researchers were surprised to find that men who have smoked marijuana had better sperm counts than their counterparts who had never used cannabis—but scientists are cautioning that the link does not mean there is a causal connection between smoking marijuana and increased fertility. 

A study published this week in the journal Human Reproduction found that men who had smoked marijuana at some point in their lives had higher sperm counts, which is associated with increased fertility.

Researchers examined 1,143 semen samples from 662 men, all of whom were undergoing fertility treatments with their partners at the Massachusetts General Hospital Fertility Center.

“Men who had ever smoked marijuana had significantly higher sperm concentration than men who had never smoked marijuana,” study authors wrote. There was no difference in sperm count between current and previous marijuana smokers. 

These findings came

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