Marijuana research is tightly regulated, because on a federal level, it is illegal. Seven states and the District of Columbia have adopted the most expansive laws legalizing marijuana for recreational use. As of the most current studies on the marijuana and its effect on cardiovascular health, recreational marijuana use potentially has cardiovascular adverse effects that are more acute than chronic. There have not been any studies as of yet published related to marijuana and birth control use. The lack of research isn’t a solid answer to your question about the effects of smoking marijuana when combined with birth control pills. However, this does not mean there isn’t any affects due to a lack of information about this subject.