Effects of cannabis on lung function: a population-based cohort study
R. J. Hancox, R. Poulton, M. Ely, D. Welch, D. R. Taylor, C. R. McLachlan, J. M. Greene, T. E. Moffitt, A. Caspi, M. R. Sears
European Respiratory Journal Jan 2010, 35 (1) 42-47; DOI: 10.1183/09031936.00065009