There is conclusive evidence that, other than nicotine, the number, quantity, and characteristics of potentially toxic substances emitted from e-cigarettes are highly variable and depend on product characteristics (including device and e-liquid characteristics) and how the device is operated
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"Even that is not a certainty, given the growing opposition to people who smoke."
Chronic cannabis users, also known as cannabis use disorder (CUD), may develop psychosis, schizophrenia, depression, and suicidal ideation
I've been using one for more than 10 years
A lung disease characterized by chronic poor airflow, most often following years of tobacco smoking