Yeah, I'll buy that.
I started smoking when I was 15-16, smoked almost daily for about 9 years. When I stopped smoking it, I started having horrible panic attacks and nasty anxiety. Took a run or two of serotonin uptake inhibitors to get back on an even keel.
But, it passed after a year or so and I really enjoy the stuff every once in a while nowadays.
Every persons results will vary.
Moderation, just like everything in life is the key.

Point... too much weed when your young is bad.
With that being said 5 of my friends/classmates have died of alcohol and other drugs in the past decade.
My stoner buddies are doing just fine, better than most actually.