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You should send a letter to the tenant, and notify the management or owner of the smoking and the vent issue. The tenant smoking in the non smoking building breaches the warranty of habitability you are guaranteed by the landlord. You can start an action for nuisance and breach of warranty of habitability against both the landlord and tenant in civil court. Also, call and file a complaint with your city/jurisdictions code enforcement to log a complaint and to get a record established.
I don't know in California if that is the law