I wish we could ban people from posting useless instigation which doesn't contribute to topics at all.
Steven many countries had problems with drugs, ranging from the Opium Wars to Legal Highs. Amphetamines post war were an issue in multiple countries, not just Japan. Just because putting draconian penalties on using a substance can remove it from the population does not mean that it's the right thing to do.
If you want a recent example, Portugal decriminalised the possession of drugs recently due to having a massive problem with them. In doing so, they've been able to help users of all substances massively, slash rates of disease and lower crime (including theft etc, even ignoring directly drug related crime). Deaths in the UK from drug use now sit over 10 times higher than Portugal and usage has decreased in Portugal, overall and in 15-24s where UK hospital admissions increased ~50% in the same time frame. Rates of continued drug use also decreased in Portugal since 2001.
I'm surprised, considering that I thought you'd rather have a smaller, more efficient government, that you're not in favour of decriminalisation, given the massive costs related to policing and dealing with late health presentations associated with illegal drug use.