I'm sorry about your friend's disease, and i'm sure that you probably feel a bit responsible for giving them LSD. I'm sure that's a considerable load to bear.
However, LSD does not simply cause schizophrenia. Schizophrenia is caused by numerous genetic & environmental factors. Sure, LSD can be an environmental factor, but without the presence of other environmental factors combined with some (possibly more important) genetic factors, schizophrenia would not occur.
And LSD is known as a partial agonist at various 5-HT receptors, a couple dopamine receptors, an adrenergic receptor or two, some histaminergic receptors, and a smattering of other receptors that i can't recall at the moment. I'm unsure of whether its an antagonist at any notable receptors, but that is of little consequence, as a lot of the minor receptor affinities are insignificant unless extremely high doses are taken.
I know it may seem like you saw your friend take LSD then become schizophrenic, but that perception does not imply or necessitate reality. Are you taking into account every drug he'd taken in his life before being diagnosed? One particularly apt quote on the subject comes from an early LSD researcher, Sidney Cohen:
The hallucinogenic experience is so striking that many subsequent disturbances may be attributed to it without further justification. The highly suggestible or hysterical individual would tend to focus on his LSD experience to explain subsequent illness. Patients have complained to Abramson that their LSD exposure produced migraine headaches and attacks of influenza up to a year later. One Chinese girl became paraplegic and ascribed that catastrophe to LSD. It so happened that these people were all in the control group and had received nothing but tap water."
I'm unaware of any differences in progression of symptoms, severity, etc in schizophrenics who's illness has been attributed to psychedelic usage versus those not claiming a specific trigger type event. But there really isn't even any reliable medical evidence to suggest a causal link exists. It isn't even mentioned on the NIH page regarding schizophrenia.
Nonetheless, if you have a family history of mental illness, its always best to err on the side of caution
Meth causes a 1200% rise in dopamine leading to pathways formed that wouldn't "normally" be formed. Deny this? Nothing in except methamphetamine does this. Therefore, it is not natural. It would not be experienced without injesting meth.
methamphetamine has been found in Acacia rigidula, according to one (possibly flawed) study. Also, the effect of this increase in dopamine does form some reinforcing pathways regarding drug seeking behavior, but it has a more notable effect of damaging pleasure centers, among other things. Not comparable to LSD by any means.
And I will compare meth to LSD, simply on the basis that LSD is not natural. It may have "positive" experiences; it's not natural. Why not use psilocin or DMT. Those are natural. LSD is man made. The brain needs nothing man made. We've survived without man made substances for how long?
Natural vs Synthetic has been a fairly common debate here in PD for some time. I'll summarize it for you to save us all some frustrated and potentially angry posts:
Natural Proponent:Natural things are better because they exist in nature
scientifically minded person: that makes no sense, plenty of things exist in nature that are horribly toxic, unpleasant, etc. I'd much rather take LSD than a tropane alkaloid contained in datura, mandrake, etc. Or what about hemlock? that's natural, who wants a glass of hemlock tea?
Natural Proponent: But shamans and indigenous people have been using natural drugs for thousands of years, they have a connection with the earth, they're much more spiritual
scientifically minded person: booze has been being distilled for about as long, and technically i guess it is also semi-synthetic. Also, members of a south african indigenous group adopted 2c-b as their sacrament and found it superior to their previous plant based entheogens.
Natural Proponent: but when i take plant teachers i feel much more connected to spiritual things and nature and whatnot
scientifically minded person: well you expected to feel that going into the experience, its called expectation bias.
Natural Proponent: something from a lab can't be as good as something from nature
scientifically minded person: man is one of nature & evolution's penultimate products, millions if not billions of years of natural selection brought about humans, thus everything we do is technically natural. where can you draw a distinction? its always going to be a grey area. other primates use tools, as do some other lower mammals, even birds can use sticks, or a *gasp* man-made metal rod, to eat insects.
Natural Proponent: obviously you're just too far out of touch with your natural self to understand, but i'm right and you can fuck off
scientifically minded person: go fuck off in a drum circle you hippie
repeat ad nauseam
