i smell cigarettes all the time Cigarette smoke is only that can follow you through a parking lot, attach itself to your clothes, move into your car, and somehow still be waiting for you when you Mystikal - I Smell Smoke

However, it is also possible that cigarette consumption actually dropped after enrollment, since subjects were heading towards a quit date and were engaged in treatment

There were no significant differences between groups related to self-reported smoking cessation at each time point except at eight-month follow-up ( p = 0.005)

To breathe life into the machine, a motor is needed

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Well leave that up to you

Whatever approach you decide to take, fairness, consistency and communication are going to be essential