Why would it be stupid? You are concentrating on the vomiting part but aren't other sensations related to motion sickness like shaky balance that drugs could help out with?
Not to mention the possibility of triggering a response that the trigger would help combat if you already exhibited the response. Or it simply being an uncommon side effect that it's made worse. Headaches and nausea are listed in possible side effects for just about everything, because if anyone reports it they have to list it since the possibility of causality hasn't been ruled out.
