This paper investigates the effect of peer smoking on individual smoking among youths in 10 countries that participated in the European Global Youth Tobacco Survey (GYTS). I control for endogeneity in school selection and unobserved school-level characteristics through the use of school fixed-effects. I use instrumental variables to address the simultaneity in peer and individual behaviours. Identification arises by comparing students in different classes within the same school. On average, an increase in the share of classmates who smoke by 10 percentage points increases the probability that an individual in that class will smoke by 3 to 6.9 percentage points. The results imply that any policy intervention such as anti-smoking messages, smoking bans, or higher cigarette prices will be even more cost-effective because of the social multiplier effect of peers – policies affecting some individuals in a group will generate spillovers to others through the peer effect.
ALI, M.M. and DWYER, D.S., 2009. Estimating peer effects in adolescent smoking behavior: a longitudinal analysis. Journal of Adolescent Health, 45(4), pp.402-408.
AKERLOF, G.A., 1997. Social distance and social decisions. Econometrica: Journal of the Econometric Society, pp.1005-1027.
BECKER, G.S. and Murphy, K.M., 2009. Social economics: Market behavior in a social environment. Harvard University Press.
BIFULCO, R., Fletcher, J.M. and Ross, S.L., 2011. The effect of classmate characteristics on post-secondary outcomes: Evidence from the Add Health. American Economic Journal: Economic Policy, 3(1), pp.25-53.
BIKHCHANDANI, S., HIRSHLEIFER, D. and WELCH, I., 1992. A theory of fads, fashion, custom, and cultural change as informational cascades. Journal of political Economy, 100(5), pp.992-1026. http://doi.org/10.1086/261849
CHEN, J. and MILLAR, W.J., 1998. Age of smoking initiation: implications for quitting. Health reports-statistics Canada, 9, pp.39-48.
CUTLER, D.M. and GLAESER, E.L., 2007. Social interactions and smoking (No. w13477). National Bureau of Economic Research.
FLETCHER, J.M., 2010. Social interactions and smoking: Evidence using multiple student cohorts, instrumental variables, and school fixed effects. Health Economics, 19(4), pp.466-484. http://doi.org/10.1002/hec.1488
GAVIRIA, A. and RAPHAEL, S., 2001. School-based peer effects and juvenile behavior. The review of economics and statistics, 83(2), pp.257-268.
JHA, P., CHALOUPKA, F.J., MOORE, J., GAJALAKSHMI, V., GUPTA, P.C., PECK, R., ASMA, S. and ZATONSKI, W., 2006. Disease control priorities in developing countries. Disease control priorities in developing countries.
MANSKI, C.F., 1993. Identification of endogenous social effects: The reflection problem. The review of economic studies, 60(3), pp.531-542.
MANSKI, C.F., 2000. Economic analysis of social interactions (No. w7580). National bureau of economic research.
MCVICAR, D. and POLANSKI, A., 2014. Peer effects in UK adolescent substance use: Never mind the classmates?. Oxford Bulletin of Economics and Statistics, 76(4), pp.589-604. http://doi.org/10.1111/obes.12030