Meh. I know how much healthier I am, and how much better I feel, since I replaced a 2 PAD habit with
vaping a bit more than 3 years ago. These things are also completely obvious to everyone I interact with on a regular basis -- my family and colleagues. Then there's the fact that I can't imagine having given up the old habit any other way. But of course Professor Chapman won't take my situation, or the millions of similar ones into account from his ivory tower.