Marijuana does affect a person's personality, because it has stimulant properties, just like Coffee and Nicotine, which stimulates the brain and causes it to release hormones like dopamine. That has nothing to do with IQ though. People always find the naturally dumb ones and make examples out of them. If people started saying that Pepsi kills brain cells, I might be more inclined to take notice of the dumb people around me who drink Pepsi, if I myself don't drink it. I might be more inclined to say "look at this guy, he's really dumb. That's what happens when you drink pepsi". Because Marijuana is illegal, you're more likely to find dumb people in the crowd who smoke it (and more importantly, admit to smoking it). Not because it makes you dumb, but because dumb people are more likely to do illegal things and admit to them. If you looked for smart people who smoke it (like billionaire Richard Branson and Apple's Steve Jobs), you'd notice that just like those who drink Pepsi, there are both dumb and smart people who smoke it. If you google "successful stoners", you'll find plenty of examples. But most smart people aren't billionaire CEO's, but still have good jobs or careers, so they aren't as likely to talk about it as dumb people who are working at Mcdonalds and have nothing to lose..........................................
Harvard Study: Intelligence, cognition unaffected by heavy marijuana use
http://www.news.harvard.edu/gazette/2001/10.11/marijuana.html
Marijuana Might Cause Brain Cell Growth
http://www.newscientist.com/article/dn8155-marijuana-might-cause-new-cell-growth-in-the-brain.html
Heavy Marijuana Use Doesn't Damage Brain
http://www.webmd.com/mental-health/news/20030701/heavy-marijuana-use-doesnt-damage-brain
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