The mayor assured city residents that the air is safe, despite lingering concerns over asbestos, chemical fumes and smoke.

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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

They then triggered them into action using a chemical called an interleukin, or cigarette smoke before adding resveratrol.

BBC: NEWS | Health | Red wine 'may treat lung disease'

Some conventional weapons or legal crowd control can also release smoke that causes respiratory problems, a common symptom of chemical weapons exposure.

CNN: Israeli official: Syria using chemical weapons

Between teaching classes at the University of California at Berkeley, he tends to other projects--trying to protect civilians from airborne chemical and biological threats and people in the developing world from harmful cooking smoke.

FORBES: Magazine Article

Their theory is that smokers smoke because their brains have high levels of dopamine, a brain chemical believed to stimulate addictive behaviour.

BBC: Smokers and drinkers 'protected against Parkinson's'

Between teaching classes at the University of California, Berkeley he is tending to other projects--trying to protect civilians from airborne chemical and biological threats, and folks in the developing world from harmful cooking smoke.

FORBES: Magazine Article