I started smoking at 14, 1-2 packs a day (I know, light weight). When I was 34, I had a massive stroke. Took 4 months to learn to recite the alphabet and count to 20 again, 6 months to learn to walk and talk again. Lived in the hospital for 6 months.
Eight months after my stroke, I was living in Dallas, renting a room as I attended a program at a Community College for survivors of head injuries. The lady I rented my room from smoked, and one day I took one of her 120mm ultra lights.
I got high off of it and started taking one or two of her's everyday, within 3-4 days, I was back on Marlboro reds again, pack or pack and a half a day . After smoking again for 5 more years, I was noting that I was getting VERY light-headed with every couple smokes.
I had a few very scary TIA's (mini stroke events) where I got so dizzy I could barely stand up, one as I was driving. I got a self hypnosis tape, listened to it one night and decided I could stop. I did.