I don't know if enforcement has all that much to do with it. I think it's just the iron law of capitalism + addictive substances. More powerful, more addictiv

I don't know if enforcement has all that much to do with it. I think it's just the iron law of capitalism + addictive substances. More powerful, more addictive, cheaper products win in the market. Everything is like this. Packaged food has better engineered flavor so you eat more. Legal weed is labelled with its (high) THC content. Even the ABV on beer has been going up a lot in the past couple of decades.