LOTS of Marijuana not harmless.
 

http://www.reuters.com/article/topNe...edName=topNews

They're looking into tests on more short-term and mild usage of marijuana.

That's quite a bit of pot. I can't say I haven't smoked that much in a day before, but daily? That's dedication.

Well no shit they're going to be retarded. 5 joints daily for 20 years is a little overboard. Abusing anything that much is going to have negative consequences.

True. Even drinking too much water can kill you.

Breathing too much air kills me.

If to much of a good thing is bad, is to much of a bad thing good?

Nope, not a biconditional.

everyone i know that has smoked that much for that long developed anxiety disorders etc and now pop xanax/effexor etc while they smoke to counter the negative effects. and it doesnt take 20 years, took me 10.