https://en.wikipedia.org/wiki/Effects_of_electronic_cigarettes_on_human_brain_development
cotinine
https://pubmed.ncbi.nlm.nih.gov/32205338/
Several studies have demonstrated that experienced e-cigarette users achieve levels of cotinine similar to cigarette smokers.
https://pubmed.ncbi.nlm.nih.gov/32383409/
https://pubmed.ncbi.nlm.nih.gov/30985285/
https://www.researchprotocols.org/2019/4/e12304/
https://www.researchprotocols.org/2019/4/e12304/#Copyright
E-Cigarettes and Cancer Risk
PMID: 31619443 DOI: 10.1158/1940-6207.CAPR-19-0346
Nicotine Toxicity: Protecting Children From E-Cigarette Exposure
PMID: 31855987 DOI: 10.1097/01.NURSE.0000615084.47597.14
https://pubmed.ncbi.nlm.nih.gov/32179055