What about smoking cigarettes increases the chance of blood clots if you take birth control? I don't smoke cigarettes, I was just wondering what the correlation was? Best Answer - Chosen by Voters Smoking cigarettes increases the risk of blood clotting.
The use of birth control pills increases the risk of blood clotting.
age increases the risk of blood clotting
Therefore it is not recommended that female smokers over the age of 35 use birth control pills to control their fertility.