PLoS ONE 13 (12), 115 (2018) Glantz, S.A., Bareham, D.W.: E-cigarettes: use, effects on smoking, risks, and policy implications
Soneji S, Barrington-Trimis JL, Wills TA, Leventhal AM, Unger JB, Gibson LA et al (2017) Association between initial use of e-cigarettes and subsequent cigarette smoking among adolescents and young adults a systematic review and meta-analysis
The results from testing were extremely impressive with no visible signs of stains and detectable odors
James Stewart
Know the Skin Effects and Remedies Quick Answer: Smoker's lips -- characterized by vertical lines around the mouth, darkened skin, and loss of lip volume -- result from repeated muscle contractions, reduced blood flow, and accelerated collagen breakdown caused by smoking