^^^^^
Well, for me personally I can see your point of view, however I don't agree with it. The problem is that while I will admit to the fact that caffeine and alcohol are indeed drugs (as with marijuana), neither of them are illegal.
Marijuana is illegal. Why would I want to hang out with someone who could put me into a situation where I am going to jail because of their drug use?
Also, I find anyone who relies on alcohol or other drugs to make themselves "feel good" as someone who obviously has some personal issues. I get sad and depressed sometimes too, but I don't take drugs to make me feel better or to escape reality.
I'm not a perfect person in any way and I don't want to tell anyone how to live their lives, but that is just my own personal view on the issue.