Dr. JJ I am currently taking an herbal cholesterol pill, and have been using Dexatrim. Also, I am not a regular smoker, perhaps I only smoke once or twice a day, of and on. I have heard that smoking increases my risk of blood clots when taking a birth control pill. I am sure drug interactions are not all known. But for oral contraceptives the main classes that have been identified are antibiotics and seizure medications.
Smoking is a risk factor for blood clotting problems associated with oral contraceptives.
Age over 35 seems to be the main determinant as to how serious this risk is. If you are only smoking once or twice a day, and it is not an issue, than maybe you can quit. If you can't quit then I would anticipate over time this addiction will increase in frequency. I have heard that this may reduce the effectiveness of my birt control pills. Dr. JJ I have been taking ortho tri-cyclen for the past year now along with amoxicillin for my acne.