Cigarette smoke is a major problem for asthma sufferers.

VOA: special.2010.09.07

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