Interestingly, there is a drug call datura, a beautiful white flower you can find all over suburbia, whose seeds when drank in a tea are an extremely powerful deliriant. If you read the trip reports of it (which are pretty fascinating tbh) you notice a common trend of people hallucinating that they are smoking a cigarette, and then they drop it, only to search around and be unable to find it. This is usually one of t…
https://ru.wikipedia.org/wiki/Апрофен
(sorry, you'll have to rely on Google Translate, there's very little info on it in English)
It's a powerful anticholinergic agent used to treat poisoning by organophosphorus compounds (like Sarin).
Like many other anticholinergics (including Datura), if taken without first actually experiencing the poisoning, it results in a deep delirium with complete loss of control over one's actions. There are lots of interesting/disturbing stories out there on the internet, most of them written in late 1990s to early 2000s before all the stockpiles had been found and used up.