Crossword Genius

Chemical result of smoking marijuana? (6)

Ross

I believe the answer is:

potash

I'm a little stuck... Click here to teach me more about this clue!

'chemical' is the definition.
(I've seen this before)

'smoking marijuana?' is the wordplay.
I cannot quite understand how this works, but
'marijuana?' could be 'pot' (slang term for marijuana) and 'pot' is located in the answer.
The remaining letters 'ash' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'result of' is the link.

Can you help me to learn more?

(Other definitions for potash that I've seen before include "chemical compound" , "Pathos (anag)" , "Type of fertiliser" , "Caustic stuff" , "Compound used in agriculture and industry - shop at (anag)" .)

I've seen this clue in The Globe and Mail.
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