I was a huge smoker till a few years ago - from my teens till I was in my late 30s. But I was one of those people who, if I had it I would smoke it, if I didn't have it, I wouldn't smoke it. i never smoked and drove, never smoked before work...I came home and took a few hits like someone would have a glass of wine. It never interfered with my life or my work.
I only stopped when my husband told me he didn't like it and I decided it wasn't worth ruining a marriage over.
I miss it more than I miss cigarettes and would definitely smoke again if I didn't think i'd be drug tested for a new job in the near future.
I never had any bad effects from mixing with anti-psychotics which I took for the last 4-5 years that I smoked.