Smoking Pot May Alter Genetic Material In Sperm, Study Finds

"The team looked at the genetic material in the sperm of 24 men who self-reported smoking pot at least weekly in the past six months, but who did not use tobacco products. From urine samples, they correlated the men’s THC levels with epigenetic changes in their sperm—that is, changes to the ways in which genes are expressed. The higher the THC level, the more changes were evident in their sperm. Additionally, the men who smoked pot also had lower sperm concentration in general, compared to men who rarely or never used it."