Those caveats suggest that approval of e-cigarettes would not be the slam-dunk it ought to be, given the enormous difference in risk between smoking and
vaping, which does not involve
tobacco (except as raw material to produce the nicotine) or combustion products. The "population as a whole" standard, as I've pointed out before, means the FDA can block the sale of a product even if it is indisputably safer than existing alternatives. So it looks like the more the FDA drags its feet, the better off consumers will be.