Use temp control and dont go above 450Fish if you want to minimize exposure.
Turns out VG is worse than PG with regards to formaldehyde:
A Device-Independent Evaluation of Carbonyl Emissions from Heated Electronic Cigarette Solvents
Turns out VG is worse than PG with regards to formaldehyde:
Significant amounts of toxic carbonyl compounds can be created when common e-liquid solvents—i.e., PG, GL, or their mixture—are heated at high temperature, either intentionally by users to get more aerosol or accidently due to overheating. GL produced much more formaldehyde than PG under our testing conditions
A Device-Independent Evaluation of Carbonyl Emissions from Heated Electronic Cigarette Solvents