I'd gear towards disallowing it if it contains any references to personal drug use, from our terms of service:
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2b. Illegal material: Do not post material which is violative of any law or which describes illegal activities such as taking, growing, buying or selling drugs, the sale or promotion of weapons, hacking, downloading pirated software, movies or music, participation in criminal offences or plans to enact criminal acts.
Note: To clarify; a discussion for example in response to a news item about drug legalisation is acceptable, but describing or promoting personal drug use, using the site to organise the distribution of drugs or to promote, organise or undertake any other illegal act is strictly forbidden.
and
QUOTE
3c. Profanity: Do not use profanity, crude, vulgar language or attempt to intentionally bypass the profanity filter.