Extremely difficult

I have been smoking for 15 years - Marlboro 100's at that. I just found out I was pregnant recently and know that it is definately the time to quit this nasty habit. Since I found out, I have craved cigarettes even more. I am down to 10 a day - Marlboro Light 100's and over the next week, I plan to be a non-smoker for life. Wish me luck, I know I am going to need it.