Gynecomastia and cannabis smoking. A nonassociation among US Army soldiers.

Eleven patients diagnosed with idiopathic gynecomastia requiring mammoplasty were compared with matched controls to determine if there was an association between cannabis use and gynecomastia. Patients with gynecomastia were not significantly different from controls regarding their history of cannabis use. For those who admitted using cannabis, patients had a higher frequency but a shorter median duration of use than controls; differences were not statistically significant. Our epidemiologic evidence does not support the previously reported relationship between chronic cannabis use and gynecomastia.