E cigarettes and smoking cessation among adolescent smokers Scientific Reports 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 Non Pharmacological and Pharmacological Interventions for Smoking Cessation Programs in Youth: A Review of Clinical Effectiveness and Guidelines NCBI Bookshelf Electronic Cigarettes for Smoking Cessation : American Family Physician