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If your friends or relatives smoke around you, very bad news
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DeadManWalking56 posted:
We know smoking is bad, and 2nd hand smoke, too.

http://www.webmd.com/smoking-cessation/effects-of-secondhand-smoke

Here is more specifics. Damage to EPCs. That means exposure to cigarette smoke greatly exposes arteries to risk of damage sites being plugged with blockage initiating immune cells rather than correctly repaired by EPCs.

"The researchers learned that in healthy nonsmokers, even brief exposure to secondhand smoke resulted in blood vessel dysfunction and interfered with the activity of endothelial progenitor cells (EPCs), which are believed to play a key role in repairing blood vessels. The damage to the EPCs appeared to last as long as a day."

As a teenager, I played cards every weekend, and many summer evenings with 3 friends who all smoked. It did not seem to affect me, but considering the magnitude of my blockages at age 53, I think the 5 years with my smoking friends may have been one more major factor for me.

Plus three years with at home smokers of a step-mother and her son.

Combined effects of 2nd hand smoke, teenagers eating a high fat diet with minimal anti-oxidants, stress of growing up, and excess transfats from chips, cookies and crackers, is almost certain serious heart disease 20 - 40 years later.
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