Tobacco

For those who have high cholesterol, tobacco use increases the risk of coronary artery disease.

Cigarette smoking lowers HDL, or “ good,” cholesterol. In addition, it damages your blood vessel lining and increases the risk of developing blood clots, which contributes to atherosclerosis. It has even been shown that secondhand smoke can lower HDL cholesterol.

HDL levels often go up soon after a person quits smoking.