As a teenager, I used to smoke quite a lot. You have to really want to give it up, not just because you're agreeing with anyone else to keep the peace. I was given a tip on how to stop - which worked for me. Everytime the urge to light up comes, take a sip of bottled still water. The urge apparently peaks after 20-30 seconds, but'll come back again. Keep taking a couple of small sips, and the urge becomes less and less frequent. After 2-3 days, you can go for long stretches without a ciggie, and by the end of a week, you don't need one at all. A lot cheaper than paying for hypnosis.