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All answers having "Smoke" as clue:

3 Character Answers:

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ANN

CIG

FAG

OFF



4 Character Answers:

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CURE

FUME

FUMO

HERB

HOLY

PUFF

REEK

UPIN

VAPE



5 Character Answers:

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ALARM

CIGAR



6 Character Answers:

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HAVANA

INHALE

STOGIE



7 Character Answers:

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CIGARET

LIGHTUP



8 Character Answers:

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DETECTOR



9 Character Answers:

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CIGARETTE

IRRITANTS



12 Character Answers:

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PARTICULATES