The welfare implications of addictive substances: a longitudinal study of life satisfaction of drug users / Julie Moschion (Melbourne Institute, University of Melbourne, EconomiX, University of Nanterre, and ARC Life Course Centre), Nattavudh Powdthavee (Warwick Business School, CEP, London School of Economics, and IZA) ; IZA Institute of Labor Economics. Bonn, Germany : IZA Institute of Labor Economics, November 2017