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Good luck to your wife, Hanco !
I used Nicorette gum to help me quit many years ago.
If she tries it, you want to NOT immediately start chewing on it.
Just let it sit there like a hard candy.
Then after 10 minutes or more, bite down ONCE and then wait a long while and do it again etc.
Those that start chomping on this gum right away are the ones that say that they don't like it.