Good idea gives smoke the air

A comedy club's decision to ban smoking at all of its shows isn'tas risky as it sounds.

Occasional smoke-free shows at local nightspots, including theChicago Improvisation, are already drawing grateful crowds ofasthmatics, allergics and people with plain old aversions to thestench of other people's cigarettes.

Smokeless clubs in other cities have catered to the health-clubset for years. Even clubs with ashtrays on the tables now haveno-smoking sections and blowers to waft the fumes away, out …