If we can prevent kids from ever starting to smoke, then we can lick this problem.

NPR: Negotiator of '98 Deal Weighs New Tobacco Ruling

"Simple steps, such as ventilation to take the smoke outside, can greatly reduce the problem, " said Manins.

CNN: Air pollution kills, but deaths can be prevented

While not necessarily proof there is a problem, they are a "smoke alarm" suggesting there could be.

BBC: Probe into 'high death rate' hospitals extended

We didn't know what to do, and there was a problem with us breathing because the smoke was too much.

CNN: SHARE THIS

Sometimes the problem is temporary, the result of an environmental insult like cigarette smoke or chemical fumes.

WSJ: How to Sharpen Your Sense of Smell