How do you tell miley to quit smoking?
You don't. He habits are her own affair.
Even if you could, you probally wont convince, unless you are a really really really really really reall close friend of hers. And I mean REALLY close.
How do you get your parent to quit smoking if your parent knows about the harms of smoking and has failed to quit before?
You can get in touch with someone to help you quit smoking in a variety of ways. You can talk to your doctor, and he or she can help you get on a quit smoking plan and help you locate local groups to help you. You can also contact the heart and stroke foundation. You can also go to smokefree.gov and find information on how to quit smoking.
How do you force someone to quit smoking do not give me anything like you can't or how dare you I just want the answer?
Use love, tenderness, patiently explain the benefits of quitting smoking, don't do it alone, ask for help from friends, tell him that to quit is not difficult, search websites for advices. You can't force, smoking is often very difficult for some people to quit it. That's a question that involve time and efforts.