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Marijuana smoking linked with higher sperm concentrations, study finds

Men who have smoked marijuana at some point in their life had significantly higher concentrations of sperm when compared with men who have never smoked marijuana, according to new research led by Harvard T.H. Chan School of Public Health. The study, conducted in the Fertility Clinic at Massachusetts General Hospital, also found that there was no significant difference in sperm concentrations between current and former marijuana smokers.

“These unexpected findings highlight how little we know about the reproductive health effects of marijuana, and in fact of the health effects of marijuana in general,” said Jorge Chavarro, associate professor of nutrition and epidemiology at Harvard Chan School. “Our results need to be interpreted with caution and they highlight the need to further study the health effects of marijuana use.”

The study will be published on February 5, 2019 in Human Reproduction.

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