I hope to give some hope, with my expierence. I have been sober a year last may 8, I feel so much better. I used to hang out with smokers and drinkers and it got more and more misrable. I finally got tired of it and was worried about my health also. I have been in twelve step groups and use it to help me. One thing that helps me is to remember my date I stopped. I couldnt stop crying. I know I wouldnt have a job if I kept it up. or my life possibly. You can do it. You will feel so much better hanging with people who dont drink or smoke weed. This will take time. Think of your future and hang in there.