Association between smoking, e-cigarette use and severe COVID-19: a cohort study (International Journal of Epidemiology, 2022)

(untitled) - Gao, M; Aveyard, P; Lindson, N; Hartmann-Boyce, J; Watkinson, P; Young, D; Coupland, C; Clift, AK; Harrison, D; Gould, D; Pavord, ID; Smith, M; et al.