Jerzyński, Tomasz and Stimson, Gerry V (2023) Estimation of the global number of vapers: 82 million worldwide in 2021. Drugs, Habits and Social Policy, 24, (2), pp. 91-103. https://doi.org/10.1108/DHS-07-2022-0028.

Jerzyński, Tomasz and Stimson, Gerry V and Shapiro, Harry and Król, Grzegorz (2021) Estimation of the global number of e-cigarette users in 2020. Harm Reduction Journal, 18, (1), p. 109. https://doi.org/10.1186/s12954-021-00556-7.