Light cigarettes

I just heard a guy in front of me in the grocery store checkout line offer the theory that the light cigarettes he was buying were "not as bad for you as the air in the city. In fact, they're good for you because they help your lungs get used to toxins."

I stared at him, searching his face for some flicker of irony, but either he had the world's most deadpan delivery or he honestly thinks that smoking cigarettes is like taking a self-defence class for your lungs, whereby they can practice fighting off attacks.

That might be the most idiotic thing I've ever heard.