Unless we have a perfect metric quantifying the “amount of harm” for every substance or practice, we will never have this kind of consistency. And then, there i

Unless we have a perfect metric quantifying the “amount of harm” for every substance or practice, we will never have this kind of consistency. And then, there is the issue of harm to self versus harm to others, and how we can weight both aspects. Consistency is in the eye of the beholder. For some people, sex is just as bad as alcohol, and they include some kind of spiritual damage as “harm to self” in their analysis. These things are necessarily subjective. Psychological damage cannot be quantified either. So it follows that consistency is subjective, and even if a legal framework could be consistent from the point of view of a certain group of people by chance, it would not be consistent in the eyes of everyone.