Nicotine gum users survey: http://www.stoptabac.ch/en/Gums/
Takes about 10 minutes; you can not answer any question that is inapplicable (as a great many of them are, since I have never used a tobacco product).
Past research using this survey:
Do you still use Nicotine gums, following your tests?
If it's worth saying, but not worth its own post, even in Discussion, it goes here.