Former smoker. Help

I have smoked for about 3 years before I got pregnant. I did the best that I could as stopped when I did. Cold turkey, I didn't think it would be this hard. I stopped it was okay but months later my addiction is coming back. I'm craving a cigarette so bad, thankfully I haven't bought one. I'm close to 20weeks. This pregnancy has been really stressful on me and I used to smoke for stress. I keep thinking after I have this baby I'm gonna smoke but I know it's horrible I just feel like I can't take it anymore. Please don't judge this has been extremely difficult stopping. Anyone else gone through this?