Just A Hypothesis

We all know the idea of a gateway drug-- some habit forming substance that might possibly lead to addiction to a harder drug-- but I pose this question: is coffee a gateway drug to speed? or is drinking coffee a "prophylactic drug," as opposed to a gateway drug, because your coffee addiction prevents you from needing speed . . . and I think you could use this logic for other substances as well, especially if the assumption is that reality is so screwy that most humans will need some sort of controlled substance to deal with it, and that there's very little possibility of zero drug usage (note the abject failure of various prohibitions on controlled substances) and so we shouldn't be worrying about the danger of "gateway drugs" and instead we should be trying to foster controlled and responsible usage of the least addictive and harmful of these substances.