Table 1 summarizes the minimum and maximum chemical emissions rates for 9 chemicals in
terms of mass (μg) of chemical per 150 puffs (70 ml/puff). The dominant chemical emitted was
propylene glycol, with a range of 250,950 – 828,750 μg/150 puffs. The chemical with the next
highest emission rate was nicotine, for which we assumed a concentration of 24 mg/ml of
nicotine in propylene glycol (i.e., nicotine emission rates calculated from the mass emissions of
propylene glycol multiplied times the nicotine concentration of 24 mg/ml); 5,770 – 19,060
μg/150 puffs.