I was smoker for more than 7 years and then i was smoke free for two years. but then i thought i can manage it to smoke sometimes, after a while i was again smoker. the most important thing: not even one puff, in party or in any other situation, you can drink as much as you want but not nicotine again, no cigarette but if you smoked it, it is not the end of the world, you can stop it the day after. don't think that everything is fuc..ed up and you failed. you have to just forget it and stay smoke free.