The exhaust fan:

In our office, the kitchen exhaust fan blows the smoke from the cooktop–back into the kitchen.
It’s a closed loop, a palliative, a noisy device that doesn’t do much except make you feel like at least you’re trying.
Most of the exhaust fans in our lives are actually part of a closed system. The detritus, pain or actions we share don’t go very far away before they turn around and head back toward us.

(Via Seth Godin)

Be nice with what you write.