NO – when it smells fishy, there is something fishy going on. The testers job is to find issues and present them to the stakeholders, no matter if it is fish or roses.

[ Atlassian Blogs | January 10, 2012 | Penny Wyatt, JIRA QA Engineer ]

You haven’t seen anything actually wrong, the feature works as intended and most likely the bad smell is just an unrelated distraction. In most cases, you’ll add more value to the product by spending time testing the next feature rather than taking time to investigate the smell. Alternatively, if you stop and investigate it, most of the time it’ll turn out to be just as it appears – a trivial issue or a non-issue.

See also Mind the Raptor