Columbia subject headings:
Authors--Drug use.
Drug addiction.
Hallucinogenic drugs.
Hashish.
Harvard subject headings:
Authors--Drug use.
Drug addiction
Hallucinogenic drugs
Hallucinogenic drugs--Personal narratives.
Hashish
Hashish--Personal narratives.
Opium--Personal narratives.
Princeton subject headings:
Authors--Drug use.
Drug addiction.
Hallucinogenic drugs.
Hashish.