Depends on what your DOC and job happen to be. As long as there is no risk of getting tested for work, and as long as you're always dead sober at work, then I'd say that it's nobody's business. Many would disagree though.
Personally, I don't generally take anything illicit. More because I don't have reliable sources than any other reason. But my DOC could easily take hold of me if I could get it, so I think that it's a pretty good thing that it's unavailable to me. If I started using again, and if my coworkers found out about it, I might have some serious explaining to do if I wanted to keep my job. As a chemist, any connection to drugs is seen as a potential ethical conflict, and I could risk losing my professional title and certification.