[fizzbatter]

For a year or so I smoked casually when i was a teen in the 90s (to look cool) with intermittent bouts of heavy smoking over days at friends homes/etc. Probably average ~1-2 packs a week. One day i just got bored and stopped. Never felt any withdrawal signs.

I'm not countering your point of it being addictive. I was so, so so lucky not to have been hooked by that at all. I don't know if i just didn't smoke enough, or what... but it's one of the few points in my life i feel like i made the right choice. Weirder yet, it wasn't even a choice.. i just sort of stopped.

[Lewton]

Some people have no problem quitting cigarettes

It's probably genetic

Also it seems to correlate with risk of Parkinson's http://www.medscape.com/viewarticle/832391

( huh that seems to be paywalled? Google "Ease of Quitting Smoking May Be Early Sign of Parkinson's")

[jawngee]

I've read you need to smoke 5 a day to form and maintain a physical addiction which is why it might have been so easy.

https://www.hri.global/files/2011/07/13/Benowitz_-_Nicotine_...