[CSM]

"Proof? How do you know this?

Can somebody post their research showing second-hand smoke never causes health problems for anybody? I'd like to read it."

It is not possible to prove a negative. To refute the above statements you must prove that ETS has killed someone. You can not prove that activity A does not cause B! You can only prove what activity A does cause.

[kegler4]

It is indeed impossible to prove a negative and I'm aware of that, but it's also impossible to say with certainty that NO waiter has ever been killed by second-hand smoke. Has the poster examined every waiter who has ever died?

The statement was completely ridiculous.