Chop-chop is its bootleg version (7)

I believe the answer is:

tobacco

(Other definitions for tobacco that I've seen before include "Smokable plant" , "20 [CASTRO] 's favourite leaves" , "make a cot cob from this plant" , "Plant associated with serious health risks" , "Leaves prepared for smoking" .)

I've seen this clue in the Sydney Morning Herald.

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