I can't wait to smoke another cigarette...?

Back in August I quit smoking cigarettes. It was very easy for me to quit because they made me sick... because I am pregnant. I found out I was pregnant in June and stopped smoking as much. The more I got pregnant the more they started to taste and smell gross. My last cigarette I had to stop myself from puking in the back seat of my husbands friends car. At first it was a relief not to smoke but as time went on I began to dream about them. I crave them sometimes and Ive almost picked the habit back up. I did, however, promise myself that if I did start again I would wait until after my baby was born.I have 2 months left and I crave them more and more everyday. I think its because I have no way to relieve stress. I've tried walking and writing but nothing works. I used to drink a lot before I got pregnant... it was pretty bad actually. Me getting pregnant and having to stay sober was actually a very good thing. I just turned 19 on the 7th of December. I drank every weekend until I graduated then it was every day. 2 weeks after graduation I found out I was pregnant. Is there anything I can do to stop myself from going back? I don't want to but with my husband and every member of my family and even my closest friend smoking all the time around me I can not wait to taste them again. Its very hard but I got off so easy with quitting I don't want to waste it. Sophie has done so much to help me I don't want to go back.