There is a strong desire for "shooting galleries" in Scotland (safe spaces to take drugs where help and clean needles are available) but the UK government and the Scottish government have very different policies on drugs.
But getting a recreational drug « approved » for sale is difficult. But maybe not impossible.
And chances are the attributes that make it relatively safe in 500mL-beer-equivalents probably make it possible to consume 10x amounts for 10x pleasure but still 5x worse negative effects than that 500mL beer.
Alcohol’s side effects contribute to its self-limiting self-administration for a good chunk of the population.
[0] https://www.ncbi.nlm.nih.gov/pubmed/6147796
[1] https://www.ncbi.nlm.nih.gov/pubmed/19465812