All of these cravings, high or low, are nicely met by the plant kingdom, which has various psychoactive agents that seem almost tailored to the neurotransmitter systems and receptor sites in our brains. (They are not, of course; they have evolved to deter predators or sometimes to attract other animals to eat a plant’s fruit and disseminate its seeds. Nevertheless, one cannot repress a feeling of wonder that there should be so many plants capable of inducing hallucinations or altered brain states of many kinds.)1
