An addict is an addict
Is an addict. It's the personality and their ability to f**k up their life with whatever they get their hands on.
Hard drugs, alcohol, food, pot, glue, sex, etc....
It's not so much the addiction of choice, but it's mis-use.
I've seen the results of all of the above, and pot used occassionally is no more dangerous than.....alcohol, food or sex. Humans have done drug altering substances since they climbed down from their first tree.