Talk to them with earnestly, sincerely, love and experience. I would like to tell them about my friends, artists and writers whose funerals I have attended in the peak of their productive lives. Smoking doesn't taste good. Do you eat foots you don't like. I would hardly thinks so.
Smoking smells - unpleasantly.
You don't know it. You have lost your sense of smell. Freedom of speech comes after the freedom of breath. If you cannot breath you surely cannot speak. Getting Cancer should be a solitary business, not being forcefully imposed on one.