Set her up for it first - before you start set her up by telling her this is really REEEEAAAALLY SERIOUS.

Tell her you love her and you want to be with her forever - BUT before you die you would really like to be with a smoker - her as a smoker.

You're not asking that she smoke forever - just a couple years then thats it. It's a medical fact that 2 or 3 years of smoking does little harm in the long run. She can do the research herself - every medical journal will tell her that.

So basically - this will do her no harm.

If she still refuses then something is seriously wrong about the give & take of your relationship. YOU sir, have given the entire relationship. Given up your fetish, given up your chances of seeing it fulfilled....and when the pact is done you will give for the rest your lives. ALL SHE NEEDS TO DO IS GIVE A FEW YEARS - thats it.

But it all starts by talking. So talk to her.