I wonder: what percentage of current agricultural capacity is devoted to stimulant drug crops? I mean tea, coffee, tobacco, khat, areca, coca, cacao, yerba mate, and so on. It seems like it must be a pretty large percentage. I wonder how much food could be grown using those resources, and how that amount of food compares to the size of the food shortage.
Don't get me wrong, I'm not saying that it would be possible or desirable to make such a substitution. It seems like there must be a reason that nearly every human culture has a tradition of using stimulant drugs. Also, I'm well aware that different plants grow under different conditions, so the land and resources currently used for non-food crops can't necessarily be used for food crops. But it would still be interesting to know the answers to the questions.