The assumption that bans/criminalization can significantly reduce demand for substances with inelastic demand is completely unreasonable given the track record of such measures. For example, demand for PEDs in professional sports is particularly inelastic because the rewards for even marginal increases in performance are so high and the penalties are so rare and low as to easily be subsidized by the increased salary resulting from use of PEDs, not to mention the cognitive and social biases that favor optimizing short-term over long-term performance.
In discussing such issues, I think that actual outcomes of previous and current banning/criminalization policies has to start being favored as the baseline effect of future policies rather than this pie in the sky idea that these sort of policies can have at or near 100% efficacy. Then perhaps we can move on from the inane moralizing that tends to accompany such discussions to a point where we can have results oriented discourse grounded in reality on these topics.
[1]Performance Enhancing Drugs, actually used more broadly to label all performance enhancing substances including human hormones and blood oxygenation.
[2]this really isn't a straw man, I've been involved in a few discussions in the last couple months in which the ban/criminalization proponents (about 4 or so different people) were arguing their position from the assumption that bans/criminalization can lead to reduction of substance usage to negligible levels.
[edited to fix formatting and to clarify footnote 1]