Can secondhand smoke increase your risk of having a heart attack?
Answers from Richard D. Hurt, M.D.
Secondhand smoke exposure is a risk factor for having a heart attack. It's thought that chemicals in secondhand smoke can irritate the lining of your arteries, causing them to swell (inflammation). This inflammation can narrow your arteries, increasing your risk of having a heart attack.
Breathing secondhand smoke can also cause the cells in your blood that are responsible for clotting (platelets) to increase in number, making your blood more likely to clot. Too many platelets can cause a clot to form that may block an artery, causing a heart attack or stroke.
Also, it appears that heart attack rates go down in areas after those areas pass smoking bans. If you smoke, the best way to reduce your heart attack risk is to quit. If you're regularly around smokers, encourage them to quit or smoke in outdoor areas that will reduce the amount of secondhand smoke others will breathe. This is especially important if you have had a previous heart attack or have been diagnosed with heart disease.
Richard D. Hurt, M.D.
Mar. 30, 2012
- Lightwood JM, et al. Declines in acute myocardial infarction after smoke-free laws and individual risk attributable to secondhand smoke. Circulation. 2009;120:1373.
- Pell JP, et al. Smoke-free legislation and hospitalizations for acute coronary syndrome. New England Journal of Medicine. 2009;359:482.
- Jefferis BJ, et al. Secondhand smoke (SHS) is associated with circulating markers of inflammation and endothelial function in adult men and women. Atherosclerosis. 2010;208:550.
- Secondhand Smoke exposure and cardiovascular effects: Making sense of the evidence. Institute of Medicine. http://www.iom.edu/Reports/2009/Secondhand-Smoke-Exposure-and-Cardiovascular-Effects-Making-Sense-of-the-Evidence.aspx. Accessed Jan. 16, 2012.
- Dove MS, et al. The impact of Massachusetts' smoke-free workplace laws on acute myocardial infarction deaths. American Journal of Public Health. 2010;100:2206.
- Mackay DF, et al. Meta-analysis of the effect of comprehensive smoke-free legislation on acute coronary events. Heart. 2010;96:1525.
- Bonetti PO, et al. Effect of brief secondhand smoke exposure on endothelial function and circulating markers of inflammation. Atherosclerosis. 2011;215:218.