"As for e-smoking, indeed e-steaming, on flights it is one of those rules that cannot be enforced"
Yes it can and is. VS advises it's customers that these are not permitted to be used on board at anytime whatsoever, for the same reasons other carriers state.
Gum, water and being occupied is your best bet as I'm not sure 'Champix' or 'Patches' will help short term