On page 12 of the novel "The Lathe of Heaven", Dr. Haber offers Mr. Orr some cigarettes and says
"Do you smoke ? The brown filters are tranks, the white are denicks."
What do the words "tranks" and "denicks" refer to ? Are they just brands of cigarettes or do they mean something else ? I've thoroughly searched Google and come across no connection between the words "tranks" and cigarettes or "denicks" and cigarettes. Tranks do seem to colloquially refer to tranquilisers in the streets or to drugs that get you to sleep/calm down but I seriously doubt that that's what Dr. Haber is offering George as George is only there because he's been abusing drugs. The words aren't misprinted.
Any thoughts? Or am I just missing something obvious ?