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Indeed, COPD stages 1 and 2 and the presence of emphysema were shown to be among the strongest independent risk factors for lung cancer, with respective hazard ratios of 1.4 and 3.5 in the Pittsburgh Lung Screening Study cohort [23, 60]

(2018) Economic Input-Output Life Cycle Assessment (EIO-LCA) US 2007 (388 sectors) Producer model[Internet], Available from: [Accessed 24 Oct, 2018] Resources used as fuels to manufacture $1 million USD of tobacco products in the United States

This experience, often called brain fog, can be frustrating and even alarming when it happens frequently

Methods of multivariate analysis

International Journal of Drug Policy