I have been in very simillar situation. I was extremely anxious most of my life and discovering tobaco and alcohol were a great help to me. For the first time in my life I was able to feel good and relax, at least temporary. In this period I got my first friends. I was maybe 14 then.
I was aware that this was wrong and it got me in a terrible adiction. But, at the time, I didn’t see a better way to function.
I did function very good at work most of the time. It didn’t stop me from being productive.
Later I had very hard time only quitting smoking. I was in a very bad job and I worked 16 hours a day only to survive. People at work treated me terribly, again while I was weak anxious target.
I started taking Benzos my mom used for sleeping. It helped me great deal.
I realised that I am not addicted to anything particular. I just needed anything to get my mind and body away from anxiety.
Later I discovered that sport helps here a lot. It decreased my stress and anxiety level. In time I stopped drinking and smoking marijuana. I have left my stress pile up over the week and then I would drink and do some drugs on weekend to relieve it all.
Later I felt hungover, empty and depressed. I din’t really see any other way and I kept doing it for years.
Lately, I changed my life circumstances. I moved to another country and got a job there. My anxiety is a lot less savere.
Since I stopped caring what people think, I have a lot less stress. I don’t feelthe need to medicate my self with anything. I still drink sometimes, mostly to be social. When I have my first drink I get into state of stress and I just need more. I will work that out too, somehow.
Truth is, I was never truly addicted. I just did everything possible to cover my anxiety