Let me tell you exactly what happened. The Captain in question is one of the biggest idiots ever to command an aircraft. He grounded the flight because the previous Captain had had a fag ON THE JETBRIDGE, not anywhere the cockpit. The Captain is so antismoking it is ridiculous for him to ground a flight because he smelt cigarette smoke.
This same wonderboy also took off from Brussels in an RJ85 after forgetting to remove the pitot cover! When he got on the groud, after continuing the flight, he quickly removed the offending item, and tried to hide it. Fortunately the f/o reported him, and he was immediately dismissed.
This type of incident is guaranteed to get you tea and biscuits with the CEO!