The burning question is... IF they divided the samples into those who used 50% PG and those who used 50% VG, what was in the other 50% ? Is there another product other than VG & PG used for e-liquid ?
I'm confused
....Participants were randomized to a four-week intervention with e-cigs containing only 50% propylene glycol (PG) or 50% vegetable glycerine (VG) without nicotine or flavors....
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