Smoking a couple of joints a week? Research warns it may make sperm ‘more mellow’ and swim in circles

8/31/17–Recent research indicates that smoking too much marijuana can cause sperm to become “more mellow and swimming in circles,” resulting in lower sperm counts by almost a third. According to Dr. Victor Chow, a clinical associate professor at the University of British Columbia Medical School’s department of urological sciences, the effect on male fertility is strong because “sperm is a very rapidly turning over cell.” Heavy marijuana use can have an immediate effect on sperm production because the male body makes new sperm about every three months. Read