There are random screenings that happen quite frequently. I would suggest he either stop smoking for the duration of his employment (seriously, it's only 2 months) or not apply.
Edit: I should add that I assume when you say he smokes, you mean pot. Cigarettes/cigars are fine. I know some workplaces have outlawed cigarette smoking recently, so I figured I should clarify since your question was vague.
And then one day you find ten years have got behind you
No one told you when to run, you missed the starting gun
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