Hello Monnamol,

I don't have any textbook answers for you, but at least a few ideas to consider.

Quitting cold turkey is a tremendously difficult thing to do.  And unfortunately, it has the worst relapse rate to go back to smoking.

The girl you specify sounds maybe a bit stubborn, and I wonder if aggressive action on your part would help very much.

You may want to consider getting as much information on local stop-smoking services, different drugs that help people quit like Zyban and the even better Chantix.  Additionally, you could consider going as far as purchasing nicotine patches and or gum to help her with her cravings.  Of course, if you smoke too, try to quit with her.

I would not, however, give her any pills of yours or other family members without them being prescribed by a doctor.  This is a dangerous and likely unhelpful path to take.  Muscle relaxants would have no effect on nicotine cravings or mood swings!

It is very good of your to be concerned about her health, but you should prepare yourself for the fact that she may reject any help you offer outright.  

To your health,

Neil MD