Because people enjoy taking drugs and they always will. Being a dictator and telling people they can’t do what they want with their own body is hilariously out of touch

In countries with universal healthcare, there is an argument that government should take a more active role in dissuading the use of substances that cause social harm and harm to the body and result in long term expenditure for public health. The detail is in how far government should go, e.g. educational initiatives, regulation, or prohibition, etc.