I tried all manner of methods for years and found them all to be flawed, particularly the gum (definitely not a good idea IMHO). I finally managed to quit using the inhalator.
The trick with the inhalator is to use the muscles in your cheek, chipmunk-style, to 'suck' the nicotine particles out, without actually inhaling anything. If you become adept at this technique, I found the inhalator worked very well indeed.
Over a period of months, I went from 10 inhalers a day to 5, to 1, to 1 emergency inhaler in the car and office...and then once you're down to a miniscule amount, it's pretty easy to go the last step as the inhaler is really now a placebo / psychological aid.
Personally, the only way I could do it was to use very gradual withdrawal.
Best of luck!