What happens if you smoke while taking birth control. Can that cause cancer?

Bad things. Smoking while on birth control pills can cause deep vein thrombosis-blood clots usually found in leg veins. These can break off and go to the lungs-pulmonary embolism-and be deadly. If you are concerned with cancer, I recommend you seek help with smoking cessation. Tobacco is responsible for many types of cancer and other terrible diseases.
Yes. Smoking is linked to many forms of cancer, regardless of whether one is taking bcps. Furthermore, there is a slight increased risk of breast cancer in women who use bcps. The combination of these two drugs is linked to higher rates of heart disease and blood clots.