True drugs are failure but life can be failure beyond just pot. Like drinking and poor health eating fatty foods. The argument is having the freedom of choice not that it is a good choice. 

Some of us get unbareable lives with challenges over bearing to deal with. 

So curbing the stress helps. Like adhd, high anxiety,  ocd etc. 

Depression another. 

I always do the best we can do & I vape eliquid. 

Weed screwed with a thought process I have from bad childhood created so didn't work out for me. 

However I think smoking anything is nonsense. I do think cbd oil should be legal as it can help adhd and I experienced it hands on helping my ocd and adhd both.