The problem was a malfunctioning furnace that not only spewed smoke, but deadly carbon monoxide.

原来是燃油炉出现了故障，它不仅向外冒出了滚滚浓烟，而且还释放出致命的一氧化碳。

youdao

I see your point. The problem is most of us are smokers and need to smoke when working.

我明白你的意思。但问题是我们大多数人都是烟民，工作的时候需要吸烟。

youdao

Ask the doctor: Is wood smoke a problem for my heart?

咨询医生：木材烟雾对我的心脏是否是一个问题？

youdao

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