Worrying about whether you adversely influenced your son's behavior or that he may repeat your mistakes and make up some of his own will not help either of you. My bet is that it will probably make things worse for most people.
It might help to find something physical to do, something that's a challenge, to break apart your anxiety like thin ice, while you walk this line. Something spiritual as well -- and I cast a very wide net for what that is.
It's a very simple thing that is extremely difficult to reverse once we get in the habit of taking responsibility for other people's mistakes and bad behavior. And I truly mean it when I write 'extremely difficult'.
The people who tried to rescue me never succeeded. Even when I warned them in advance.
I for one am worried about your smoking. And you must be as well. See what you can do about that.