It's funny the article does not mention a study on prolonged affects of Mary J to the brain. That's what I was looking for. The study it self is something most people new. People thinking weed is more addictive than heroine.. First I heard of it. Gateway drug, no weed does not give you the craving for other drugs but for some personalities when weed is not good enough they move on to others. Brain functions when high, had a kid in high school he was f in brilliant even scored the highest in physics while high calculating three decimal points in his head. Imagine if he wasn't a stoner. All in all I say legalize marijuana it's another tax revenue for the government I won't be paying.