The safety edge here is engineering
We do know that they contain nicotine, which is highly addictive and a health danger to you and your fetus if you are pregnant, children, and teens
Discreetness: Some individuals prefer to keep their smoking habits private
J Allergy Clin Immunol 136:769780 Hoffmann RF, Zarrintan S, Brandenburg SM, Kol A, de Bruin HG, Jafari S, Dijk F, Kalicharan D, Kelders M, Gosker HR, Ten Hacken NH, van der Want JJ, van Oosterhout AJ, Heijink IH (2013) Prolonged cigarette smoke exposure alters mitochondrial structure and function in airway epithelial cells
White MC, Holman DM, Boehm JE, Peipins LA, Grossman M, Henley SJ
"I didn't smell disgusting." His favorite flavor is candy apple-strawberry, he said