Do you still use Nicotine gums, following your tests?
Yes.
EDIT: I should explain that a little more: the one test was not definitive. It would've been nice if I could have shown a real effect on WM, but effect or no effect, the literature on nicotine & mental performance seems solid enough to override one particular kind of test.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.