Answer:
No, not all hallucinogenic drugs are synthetic. Hallucinogens can be either natural or synthetic. Some hallucinogens are found in plants, such as psilocybin, which is found in certain species of mushrooms. Other natural hallucinogens include mescaline, which is found in peyote cactus, and dimethyltryptamine (DMT), which is found in various plant species.
On the other hand, synthetic hallucinogens are created in a laboratory and include drugs like LSD (lysergic acid diethylamide), MDMA (3,4-methylenedioxymethamphetamine), and PCP (phencyclidine).
It's worth noting that while natural hallucinogens have been used by indigenous cultures for centuries, synthetic hallucinogens are a relatively recent invention.