Give me proof with sources that says its bad for you.
I don't have a source but inhaling smoke is always going to be "Bad" for you, the thing is is that it's not going to kill you unless you smoke excessive amounts.
Also being clear this is in no way attributed to marijuana it's inhaling smoke.
Weed has been known to wear down on one's mental capacity with continued use, and makes one more irritable when not high.
Again I think it all comes down to how much you get high, if you get high 6 out of 7 days of a week (Nonstop) of course you're going to feel bad afterward.