It is true, most people do not take marijuana seriously. As a heavy user (more than 15 years smoking daily, more than 3 g per day ), I have tried many times to quit smoking weed, none of them succeeded for long. Basically, I'm surrounded by smokers, almost all my social environment, inside of my house in front of me all the days. This is one of the main reasons why my attempts have failed. Other reason is that I love smoking weed, apart from the fact that I know I should stop smoking or try to smoke socially (but I can't). Marijuana gave me good times. It also gave me bad times. It stole a certain part of my life, since I dedicated too much time to it and little to other things. It's really hard to have fun without smoking, specially hanging out or on a tedious Sunday at home with people blowing smoke in my face.
Most of my friends who quit smoking nowadays they drink two/three times more than before. They can't hang out without tripping balls, they need to replace weed with another drug (legal or illegal). I don't like drinking at all. I cannot imagine myself completely sober at the night, partying. Is it possible to party sober? Of course, I am not considering other drug as a substitute. I don't think I would adapt to a sober lifestyle, I am a stoner!