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"For people who have a pre-existing illness, follow your medical plan, have access to your medication, to your inhaler, and make sure you don't go out for a jog." That advice also applies to healthy people: you should avoid exercising outside when you can see smoke in the air.

Whenever the weather is good enough and I have a pretty low bar for good enough, if it's anywhere above freezing or even slightly below I'll run outside

Each cigarette contains 25 mg of tar and 1.7 mg of nicotine

And 15 years after kicking the habit, your risk for heart disease mirrors that of a nonsmoker, according to the American Cancer Society

The survey also asks smokers how many cigarettes they burn through each day