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Several health risks go along specifically with smoking
while on the birth control pill. There is some evidence that smoking can decrease the effectiveness of hormonal
birth control. Smoking causes a breakdown of estrogen
, thus lowering the body's estrogen levels, which in turn plays a role in the effectiveness of the pill. Some smokers will experience spotting or breakthrough bleeding
on the pill, more so than non-smokers. This could signal that the efficacy of the pill is lowered.