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All answers having "Marijuana" as clue:

3 Character Answers:

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POT

TEA



4 Character Answers:

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DOPE

HEMP

WEED



5 Character Answers:

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GANJA

GRASS



6 Character Answers:

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GANJAH



8 Character Answers:

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CANNABIS



11 Character Answers:

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GATEWAYDRUG