Smoking weed generally "IS" bad, because most people who do, especially kids, use it as an escape, this is the same as alcohol abuse, which I am not happy to admit, I've committed..
Now, the second part of the problem is.. while health risks are low... Marajuana use "greatly" increases lethargy (apathy)... Reduces motivation and hinders focus..
You can see how if you get into a "cycle" of the above, it would NOT be very helpful to one's productivity..
To every Pot head who "isn 't " where he thought he'd be in life... there's little wonder as to why...
To the Pot-head that "made it" well,, congratulations,, you've won the lottery,, like every one who's "made it"