Taken from Wikipedia about the drug, "Datura stramonium", or, "jimsonweed".
"...a few anecdotal reports also mention the user's perception of "phantom cigarettes"; the person believes that he or she is smoking a cigarette only to find that it has disappeared later, thus realizing that it never existed. This hallucination is reported among both smokers and non-smokers. There have been reports of the user interacting with other unreal objects also, such as looking down and seeing a cigarette lighter in one's hand then dropping it, and after a minute or two of searching, the user often realizes that this lighter or any other unreal object never existed."
Probably the only drug on the planet that can make you believe that hallucinations are reality. Enjoy the song, Newgrounds;
-Zenon