Welcome to SR. You'll find a lot of support here.
I was a pot smoker and drinker too.
For me the first step was to stop smoking and drinking - everything else flowed from that. It took some changes tho, and not always easy ones.
I was in a fairly hard drinking, hard smoking crowd as well - I found I had to put my sobriety first and leave that crowd behind, as what I was doing was literally destroying my life.
The good news is I found the kind of life I wanted. I hope you do too
Hope to see you around some more