TY - JOUR T1 - Doubts about the role of cannabis in causing lung cancer JF - European Respiratory Journal JO - Eur Respir J SP - 815 LP - 816 DO - 10.1183/09031936.00051108 VL - 32 IS - 3 AU - R. A. Sewell AU - A. J. Cohn AU - M. C. Chawarski Y1 - 2008/09/01 UR - http://erj.ersjournals.com/content/32/3/815.abstract N2 - To the Editors: We read with interest the article by Aldington et al. 1 entitled “Cannabis use and risk of lung cancer: a case–control study”. However, we are concerned that the conclusion stating that “long-term cannabis use increases the risk of lung cancer in young adults” is inadequately supported by the data, given the study's several methodological flaws. First, Aldington et al. 1 argue that the risk of lung cancer increases linearly by 8% per pack-yr smoked, based on the assumption that cancer risk from cannabis smoking is similar to cancer risk from tobacco smoking, which also increases linearly with pack-yrs. … ER -