"some chemicals present in e-cigarette aerosols (e.g., formaldehyde, acrolein) are capable of causing DNA damage and mutagenesis."
Formaldehyde is definitely a carcinogen.
OTOH, smoking marijuana is good for you. /s
It is but its never produced during normal vaping. if a machine is sucking in vapor to analyse it, it can easily burn the wick and produce formaldehyde, a person would taste that and change the wick or coil.