Effect of unguided e cigarette provision on uptake, use, and smoking cessation among adults who smoke in the USA: a naturalistic, randomised, controlled clinical trial eClinicalMedicine e Cigarettes: Smoking Cessation Expert Says Too Many Unknowns myCME E cigarettes and health: the jury is still out Harvard Health Should Vaping Be Banned In Public? e cigarette, les modles pour experts. Electronic Cigarette approach to Quit Smoking Device Electronic Cigarette