What do you think of me smoking my cigarette inside of the diner?
Were people upset at you?
Yes, one of the waitresses came up and told me that it's against the law.
Smoking inside of a restaurant is illegal. Breaking the law in this way inconveniences everyone, including yourself.
I don't give a fuck about my health.
Your feelings about your own health does not give you the right to jeopardize the health of other people that do care about their health. You should never smoke inside of a restaurant or other public area, unless their is a specific section for doing so.