True; it seems there's some more fuzzy element involved, involving how the substances are used rather than their intrinsic potency. For various reasons, turning nicotine into a more potent drug hasn't become popular. And, tobacco leaves smoked as-is are not acutely dangerous (only chronically dangerous). But, the same is basically true of coca leaves. The difference seems to be that coca leaves are refined into more potent/dangerous recreational drugs, but tobacco leaves aren't.
