Taking cannabis doubles the risk of men under 30 producing abnormal sperm which could significantly lower their fertility and prevent them from having children, according to the world’s largest study into lifestyle and sperm quality.
Researchers found that drinking alcohol and smoking cigarettes do not appear to have any effect on the size and shape of sperm that men produce, although cannabis had a marked impact on sperm morphology in younger men.
Cannabis doubles younger men's risk of infertility, study finds
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