Found a pack of unfiltered cigarettes when I was 12 so I decided to smoke them. I smoked the whole pack in about 3 hours. At first only puffing one or two smokes from each before putting it out and when done with all 20 of then I relight the buds and smoke the rest. One week later somebody gave me a filtered cigarette which after a pack of unfiltered seemed like the best thing ever. I smoked for 15+ years till I decided to quit, well not exactly quit cause I am not a quitter but for the last year I only smoked occasionally couple cigarettes per month.
I had my lungs checked to see what were the effects for starting smoking at such a young age and my lung function, capacity and health is well above a normal person, actually it's so good that most the devices they used to measure my lung function went off the scale, even my doctor joked that I can start smoking full time again with no problems.