What to say to a smoker
This is a nonsmoking area.
This is a nonsmoking building.
You’ll have to step outside.
Please observe the no-smoking
Can you put that out?
Please put that out.
I’m sorry, you’ll have to put that out.
I’m sorry, the smoke is bothering me.
Have you ever thought of quitting?
It’s your funeral.(informal)
You smoke like a chimney.(informal)