How much cannabis is too much for those who start smoking as adults? New subscribers to our e-newsletter always receive a free gift. Get yours here: https://nutritionfacts.org/subscribe/ What if you start before age 25? See my last video: Does Marijuana Cause Permanent Brain Damage in Teens? (http://nutritionfacts.org/video/Does-Marijuana-Cause-Permanent-Brain-Damage-in-Teens). All my upcoming cannabis videos can be streamed