Beliefs about nicotine influence cigarette craving: participants failed to satisfy their craving by simply smoking a nicotine cigarette. The participants had to actually believe that the cigarette contained nicotine.

See the source article by following the link below:
Beliefs about nicotine influence cigarette craving: participants failed to satisfy their craving by simply smoking a nicotine cigarette. The participants had to actually believe that the cigarette contained nicotine.