There once was a Tarotic Dino; Who courted a horny young Rhino; The made love for a week; And they danced cheek to cheek; After while came a Wine-Dine Bambino
[Raak]It is explained in OneLook (halituous=like breath; vaporous) and the line is supposed to mean that you end up as smoke instead of reaching nirvana if you are stupid enough to use that drug (please also note the attemt to get a double rhyme with line 1).