Just add another example, beef consumption is very low in Hindu countries even for non-Hindus. Similar observations are true for Muslim areas and pork consumption. Case in point is that a strong cultural identity can bring about a soft enforcement of certain practices (in Japan's case potentially help to explain lower drug consumption rates).

Worth also noting that in Asian countries, attitudes to and awareness about drugs are very extreme. Beyond being far more socially deplorable, most people also harbour ignorant views on the physical harm drugs can and can't cause. There is also less glamorisation of it in media.