I tried quitting about 3 times before. The last time I tried (last summer), I used the gum. Worked great for about a week, then it just seemed to wear off and have no effect (and no, I was not just chewing one the entire time!!!). I sneaked a cigarette after a week ("hmmm it's only one....") and within 3 days I was back to smoking 1/2 to 1 pack a day.
About a month ago, a colleague was describing in graphic detail images he had seen of people afflicted with smoking induced illnesses. Usually I just turn away and ignore such conversation, but decided to listen. Disturbing stuff. Later that night I went home, surfed the net and found some photos of diseased lungs, people without a voice box etc... and forced my self to look at them, and realize that WILL be me if I don't quit. I finished the last cigarrete in the pack and vowed never to smoke again. Haven't touched one in 3 weeks now, and boy did I go through some trying times (try drinking a bit of alcohol around smokers), but glad to say I haven't taken one puff!

Best attempt so far. What also keeps me going is that I tell myself that if I light up again, even one, I will have failed this attempt to quit. And if I fail this time, I'll NEVER quit.
It really is a case of strong willpower and trying to change the way your mind thinks. As a smoker, I simply tried to ignore all the warnings of health problems and good advice from friends. I'm sure this is typcial smoker mentality and not just me. Face the possible consequences of your actions, and Im sure it'll help.
And next time I feel the urge to smoke, I'll be sure to plan a quick trip to the local cancer ward!
Good luck with quitting, hope this has been some help.
(Sorry for the long somewhat incoherent post. Too excited about Santa coming and can't sleep, despite feeling tired

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