Have I ever smoked?
Will I ever smoke?
"I do not smoke" implies a willful intention to refrain from smoking. "I didn't smoke" only implies that smoking didn't occur at the time in question.
Seriously, if you can't see the difference between the usage "I didn't drink (last night)" (what about tonight? what about the night before?) and "I don't drink" (period.) I can't help you.
SD