My Dad smoked 3 packs of Camels each day. He developed a cough that was so bad he was waking up to cough. He went to see his physician, a crusty old man named Ned O'Conner, who asked what was the problem.
I have a cough, my father said.
Are you still smoking?
Get the hell out of my office!
And don't come back until you have not had a cigarette for 2 weeks. Then we will talk about your cough.