"I was out with some friends drinking, I thought I could enjoy that one cigarette with being smoke free for 5 years. Was I wrong, it was gradual but i started smoking more, then it went to almost a pack a day."
To an addict, there is no such thing as "just one." It will inevitably lead to another, and another, until you are a smoker again. If you drink, it's easy to think it's OK.
Please don't chance it. A quit is a terrible thing to lose.