Table 4.

First rows are outcomes of metal elements reported by Olmedo et al. [10] given as ng/puff values converted from their µg/kg concentrations (see supplementary file). The second rows are daily exposures form 250 daily puffs and third rows are toxicological reference markers from Table 2. Minimal values in the range of $O\sim {10}^{-3}$µg are not displayed.

Metal	Al	Cd	Cr	Cu	Fe	Mn
ng/puff	0.07–0.52	<0.01	0.002–1.02	0.03–1.19	0.002–1.65	0.001–5.5
daily exp. ($\mathsf{\mu }$g)	0.0175–0.13	<0.0025	<0.255	0.0075–0.298	<0.4125	<1.375
Tox. Ref. ($\mathsf{\mu }$g)	33,300 NIOSH	3 PDE	3 PDE	30 PDE	33,300 NIOSH	6 ATSDR
Metal	Ni	Pb	Sb	Sn	Zn
ng/puff	0.03–6.74	0.02–0.86	<0.45	0.01–0.45	1.28–18.88
daily exp. ($\mathsf{\mu }$g)	0.0075–1.685	<0.215	<0.1125	<0.1125	0.32–4.72
Tox. Ref ($\mathsf{\mu }$g)	6 PDE	5 PDE	20 PDE	60 PDE	33,300 NIOSH