Hmm, I did not get that from the cookbook, but did try it back in the early 90s. Drying out the inside scrapings of the peel, then smoking the brown resulting powder. Tastes awful but gave a mild, dreamlike buzz, similar to low-dose moonflower.
Even though researchers at New York University have found that banana peels contain no intoxicating chemicals, banana peels do contain the psychoactive neurotransmitters tyramine and dopamine in significant amounts that if ingested are enough to affect people. The most characteristic effect of the interaction is a massive increase in blood pressure, leading to a hypertensive crisis, and possibly arrhythmia and death.[2] Bananas contain tryptophan which, when ingested, increases levels of serotonin in the body. This can lead to various mood-altering effects (Leathwood and Pollet, 1982) including a reduction in depression (Sainio et al., 1996). As well, Xiao et al. (1998) found that eating just two bananas a day for three days increased levels of serotonin in the blood by 16%. However, there is no mention in the literature of tryptophan having any hallucinogenic effects; it has, in fact, been used to reduce hallucinations in patients with mental disorders — from forums.ubi.com
We did this as a group a handful of times. Again, just anecdotal; we could have just thought we were getting some effects, but it was pretty real to me and I can still recall the minor feelings it gave. So I don;t know.