^You'd be surprised...
This is why some call it the "War on Some Drugs", there really are "legal" products you can buy that do contain psychoactives...not for human consumption of course.
HBW and Morning Glory seeds contain LSA and other alkaloids related to LSD...the doses for morning glory seed is in the hundreds - thousands of seeds while the HBW seeds do not require as many seeds for effect.
Peyote isn't the only mescaline containing cactus, there are others such as the San Pedro that contain mescaline and will cause you to hallucinate if properly consumed.
Salvia Divinorum extract causes short-lived but very intense hallucinations.
Amanita muscaria mushrooms contain muscimol and ibotetic acid (which is metabolized into muscimol) the effects include euphoria and a dream-like feeling.