since I liked my first puff of cigarette smoke I was addicted from the first puff.
Not at all and you're correct that physical addiction takes some (variable) amount of time, depending on the substance. That said, I find it very hard to believe you actually liked/enjoyed your first N cigarettes. The motivators to take up smoking are varied, but "enjoy" in the common sense of the word isn't one of them. Thoughts to the contrary are, I suspect, rose-colored remembrances.