Please dont read if you have a weak stomach......

I really am wondering if I have something more seriously wrong with me than my Dr. thinks. When I was pregnant with Natalie I got really horrific cravings for cigarettes, not to smoke(I've never smoked anything in my life)....to eat. I never did thank goodness, but I had to take iron supplements to help suppress those cravings. Yesterday, they hit me hard again, only this time I am not pregnant. I dont know what to do. I know it sounds like the grossest thing ever but I am really having a hard time with this! I went to get Natalie off the bus today and noticed that I was chewing on something only to spit it out and notice that it was a cigarette butt, I must have subconconciously picked it up off the ground and tossed it into my mouth. What do you think I should do?