"Thou Shalt not Smoke": Religion and smoking in a natural experiment of history.

We provide a new identification strategy to analyse the implications of religious affiliation on unhealthful behaviour by focusing on the link between religiousness and smoking. Our quasi-experimental research design exploits the exogenous dramatic fall in religious affiliation that took place in East Germany after the post-war separation. Our conditional difference-in-differences estimates on data from the German Socio-Economic Panel (SOEP) for the period 1998-2006 indicate that individuals who are not affiliated to any religious denomination are consistently 13-19 percentage points more likely to smoke than are religious individuals. We interpret our results on the basis of a restraining effect of religious ethics on unhealthy behaviour, confirming the view that religion is a far-reaching vehicle for the enforcement of social norms.