Strange - doesn't mention Nicotine. I believe in patch or lozenge this has as much affect as caffeine [1]. Note that I'm not advocating smoking, just the nicotine itself.
1. Nicotine can have a lot of positive benefits. As one of their experts stated, “Good drug, bad delivery system.”
2. One of those benefits is a possible anti-depressant effect. So smoking may inadvertently be treating a person’s undiagnosed mental health issue[2], an additional difficulty when trying to quit smoking.
This second point has made me a little more compassionate towards smokers, and to the difficulty of quitting. (As least in theory, still get annoyed when I can smell cigarette smoke on myself after a trip down to the shops because of some smoker on the sidewalk.)
[1] http://freakonomics.com/2014/04/03/how-to-make-people-quit-s...
[2] NOT advocating this as an excuse to continue smoking. There are better treatments.
It seems like choosing to chug anti-freeze when you've got high-class liquor available.