Which makes it plausible that banning the latter could succeed where banning alcohol did not ... but there's no actual evidence for that proposition. The ban on other drugs is enriching criminals and corrupting the law enforcement system as banning the drug alcohol did.
"That a main source of difficulty is in the attitude of at least a very large number of respectable citizens in most of our large cities and in several states, is made more clear when the enforcement of the national prohibition act is compared with the enforcement of the laws as to narcotics. There is an enormous margin of profit in breaking the latter. The means of detecting transportation are more easily evaded than in the case of liquor. Yet there are no difficulties in the case of narcotics beyond those involved in the nature of the traffic because the laws against them are supported everywhere by a general and determined public sentiment." --Report on the Enforcement of the Prohibition Laws (1931) by the National Commission on Law Observance and Enforcement