Your opinions on marijuana?

I've been in this massive argument with this guy on fb who thinks marijuana is healthy for you and has no bad effects whatsoever. I want to get some other peoples opinions, especially if you are a doctor or other professional. Also if anyone can reference some non internet sources with info on marijuana it would be great.

And please don't tell me to give up on the argument he's promoting this drug to young teens and it's horrible.
 
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