Ganja is a slang term for cannabis and the word is associated with the West Indies, but actually originated in India.
Merriam-Webster Online Dictionary
ganja (noun) a potent and selected preparation of marijuana used especially for smoking , broadly - marijuana
Ganja (Wikipedia)

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Ganja or ganjah (/ˈɡɑːndʒə/, UK: /ˈɡændʒə/;Hindi pronunciation: [ɡaːɲd͡ʒaː]) is one of the oldest and most commonly used synonyms for cannabis flower, specifically marijuana or hashish. Its usage in English dates to before 1689, borrowed from Hindi and Sanskrit gāñjā.
Ganja (Wiktionary)
English
Alternative forms
- ganjah
- ganga, gunga, gunjah (obsolete)
Etymology
Borrowed from Hindi गांजा (gāñjā), ultimately from Sanskrit गञ्जा (gañjā, “hemp”). First use appears c. 1800.
Pronunciation
- (India) IPA(key): /ˈɡɑn.d͡ʒɑ/
- (Received Pronunciation) IPA(key): /ˈɡæn.dʒə/
- (General American) IPA(key)
Cannabis, Mary Jane, Ganja, Dope, Reefer, Hash, Bud, Chronic, Skunk, Green, Smoke, Joint, Blunt, Doobie, Spliff, Kush, Hemp, Sativa, Indica

