There is a question very similar to this but it doesn't answer my question.
I'm an employee. My co-worker is a contractor. I asked him to stop vaping in the office he shares, but he's ignored my plea.
Management knows he vapes, but I think they're unaware it's illegal in the state and likely against policy. And they saw it only when we weren't sharing an office.
So who do I ask to intervene? HR, who'll then contact management? Or do I bother management about it directly? I don't want to go over anyone's head, except this contractor.