Table 3. Carbonyls and volatile organic compounds (VOCs) concentrations measured in the vapors of liquid refills mixtures (commercial, cannabinoids standards and BHO dilutions).

	n	Aldehydes		VOCs
		Formaldehyde	Acetaldehyde	Propylene glycol
		Mean(μg/mg e-liquid)
E-liquid without nicotine	3	0.14	0.03	150
E-liquid, 9 mg nicotine	3	0.22	0.18
E-liquid, 18 mg nicotine	3	0.17	0.05
THC in e-liquid without nicotine	1	0.01	0.01
THC-A in e-liquid without nicotine	1	0.02	0.02
BHO 5% (decarboxylated)	1	0.04	0.02	35
BHO 10% (decarboxylated)	1	0.42	0.15	43
BHO 5% (non-decarboxylated) in e-liquid without nicotine	1	0.21	0.46	45
BHO 10% (non-decarboxylated) in e-liquid without nicotine	1	0.29	0.31	96
BHO 5% (non-decarboxylated) in pure PG	2	0.15	0.32	75
BHO 10% (non-decarboxylated) in pure PG	5	0.31	1.1	94