Quote Originally Posted by Bobmuhthol View Post
Year 1: I smoke a pack a day, and I decide I want to quit
Year 2: I smoke 9/10 of a pack a day
Year 3: I smoke 8/10 of a pack a day
Year 4: I smoke 7/10 of a pack a day
Year 5: I smoke 6/10 of a pack a day
Year 6: I smoke 5/10 of a pack a day
Year 7: I smoke 4/10 of a pack a day
Year 8: I smoke 3/10 of a pack a day
Year 9: I smoke 2/10 of a pack a day
Year 10: I smoke 1/10 of a pack a day
Year 11: I smoke 1 cigarette a day
Year 12: I smoke 1 cigarette every other day
Year 13: I smoke 1 cigarette every third day
Year 14: I smoke 1 cigarette every week
Year 15: I stop smoking

I've quit cold turkey?
Going off the evidence you provided I would say this is an example of a slow and gradual decline over a period of 15 years. I took about 3 weeks to go from a full pack and slightly more to half a pack.