Pot isn't a terrible substance. Especially not when compared to alcohol.
For example, it frequently leads to a lack of believe in - or even just consideration for - how terrible substance consumption is, over all if not for the sake of nutrition.
http://cannabisandpsychosis.ca/more-information/what-do-we-k...
http://www.thelancet.com/journals/lancet/article/PIIS0140-67...
Hope this helps.