I'm not sure shouting at people in the street or going to tell people at your work to stop smoking is healthy......sounds like your projecting your issues and struggles with smoking on to these other people. Out in the fresh air they are fully entitled do smoke as they wish, people need to be allowed to find their own path and you will never get anything but derision by forcing your opinions on them.
I also quit smoking 5 years ago now so do understand how you are struggling. It sounds like your drinking was an excuse for you to smoke so after you could say I only did it because I was drunk.