MR; Ryk, L; Gilljam, H; Adermark, L (13 Oct 2021). "Electronic cigarette use and smoking cessation in cohort studies and randomized trials: A systematic
toxicological risk assessment principles to the chemical constituents of cigarette smoke". Tob Control. 12 (4): 424–30. doi:10.1136/tc.12.4.424. PMC 1747794