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An unfortunate side effect of helping innocent subjects escape the tyranny of the lie detector is the aid unavoidably provided to dishonest candidates who really should be filtered out. 

Of course if hiring agencies would drop the polygraph and redirect its funding to better BI processes, perhaps they'd actually improve the candidate pool instead of just reducing it at random. You'll note there is no book titled The Lie Behind the Background Investigation. 

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What you can do is either include your minor marijuana use in your application disclosure and answer honestly during the polygraph test, OR omit your minor marijuana use from your application disclosure and never ever admit to the polygraph examiner even if he seems to know all about it. 

What you do *not* do is omit your minor marijuana use from your application disclosure, and then let the polygraph examiner bully you into an admission. I don't like to be harsh but if you do that then you don't deserve the job -- not because you are a druggie, which you're not, but because you are foolish. 

What you should also understand is that all this fuss about toking a spliff now and then is not in any way about the evil of drugs, and the tyranny of the polygraph exam is not in any way about honesty and lying. These are social tools used by a person with a little bit of power, such as a police detective or a potential employer, to make you feel bad about yourself, so that you'll feel grateful for having a crap job and not being in jail.