I think with my habits I'll end up a smoker and alcoholic like my parents
Is there any connection between your parents and your state of mind?
Probably. Their lifestyle has always been something I wanted to avoid, so it's hard for me to even see them sometimes. They have a lot of issues.
Your parents should set better examples for their kids. You have every right to be upset if they are smokers and alcoholics.
Maybe. Sometimes I get to see the good in them, but they make it difficult when they choose to be assholes.
It really sounds like a tough situation. How about trying to have a sit-down talk the next time they are able to see you? They need to realize what they are doing to you, and it might be a wake up call for them to get sober.