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Burke MV, Ebbert JO, Hays JT

Parekh notes, Heavier and more frequent use tends to be associated with greater reductions in sperm concentration. This observation is supported by a 2015 study conducted in Denmark, which included 1,215 men and found that regular marijuana users (those who smoked more than once a week) had sperm counts that were 29% lower than men who had never used marijuana