Have your wife put a dab of superglue on the end of random cigarettes in each pack. When you light up take a deep drag.Now, I smoke cigarettes (yes, I'm sadly still not quite smart enough to quit),
Several of my cousins were terrible thumb suckers when they were little.
Nothing would stop them.
Someone suggested dipping their thumbs in hot sauce a few times a day until they quit. It took less that two days and not one of them ever did it again!