Marijuana+Effects

http://www.psychologytoday.com/blog/your-brain-food/201106/does-it-matter-when-you-start-smoking-marijuana

The results were quite interesting. Those children who started using marijuana prior to age 15 performed more poorly on all aspects of executive function tasks as compared to people who starting using marijuana after age 15 or those who had never used marijuana. Thus, chronic marijuana use prior to age 15 will have far more deleterious effects on complex brain functioning than if one begins using marijuana after age 15. In addition, both males and females who started regular marijuana use prior to age 15 were physically smaller in height and weight; this effect was most dramatic in the males. The effects of marijuana use prior to age 15 were still evident in people who were age 55 at the time of behavioral testing! Why?

https://www.youtube.com/watch?v=4SvkaK2Al0o&feature=plcp

http://www.psychologytoday.com/blog/your-brain-food/201012/alcohol-vs-marijuana-in-the-brain