What is the difference between have you ever and do you ever?

If you have done something in the past but you no longer do it - for example, perhaps you used to smoke cigarettes but you gave it up - then you would answer yes when asked have you ever done that. The question do you ever, in comparison, is asking about something that you continue to do. If you no longer smoke and you are asked, do you ever smoke, the answer is no, you do not smoke, even if you have smoked in the past.