"You Can't Do That Here" joke

A guy walks into a gas station and buys a pack of cigarettes. He pulls one out and starts smoking it.

The cashier says, "Excuse me sir, but you can't smoke in here."

The guy says, "Don't you think it's kinda dumb that I buy them here but can't smoke them here?"

And the cashier replies, "Not at all...we also sell condoms here and you can't use them here."