These negative studies have been coming out for quite some time now. And having come out of the hippy era myself, my drug use started when I was in my 20's and ended a few years later - way after puberty.Don't you find it interesting that negative studies like this always come out when weed is making legal strides?
I know lots of people that came out of the Hippy era, that smoke to this day, - and they aren't stunted in any way.
A Harvard Medical School study actually found that people who smoked a lot of weed early in their lives - had less dementia and Alzheimer's in their old age.
Obviously it also helps with a lot of medical conditions - including seizures in children.
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And, of course, just because because a drug, any drug, can be useful for medical conditions, it does not mean that the drug is harmless nor that large does cause problems.