Nasty Habit

So my bad habit is im a smoker, and I'm really trying to stop, but sometimes I'll get the craving of wanting to smoke. I've tried just going cold turkey, then something would stress me out , I'm back to buying a pack then I'll feel bad after smoking. I really want to stop is there any tips someone can give me that was a former smoker?. I know it's time for a change especially when I'm ttc. Thank you