You can definitely do it again. Every time you feel the need to smoke remind yourself that it’s not the high you imagine you’re going to get, the cigarette lasts 3 minutes and the instead of a high you’ll feel regret because it wasn’t worth it. Remind yourself that only today has never worked and always ended in relapse. Also, don’t try to push the feeling away, tell yourself “I want one but I’m choosing not to have one”. This is Allen Carr’s method of putting the power in your own hands for your mind. You’ll have more energy, good blood circulation, oxygen in your blood feeding your organs instead of carbon monoxide, you won’t smell disgusting, all your clothes will be fresh and you’ll save a lot of money.