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As stated, these would be useful only for those who were interested in quitting--to put it mildly.

Anyone whose "interest" waned when the nicotine dose failed to do the chores would either be smoking way more in a frenzy to find satisfaction or going out to find "a REAL smoke".

The study parameters might be informative. For instance, did the subjects have ready access to full-strength cigarettes during the test period? Was "flavor" ruled out as a confounding "promoter of abstinence"? How about just being involved in a study?

Outside of the abstinence thing, this approach doesn't seem to hold much for nonsmokers.