Most smell problems are not the filter itself, they're leaks: open zips, loose duct joints, or an intake that sucks air back out of the room. Make sure all the exhaust air goes through the filter, and check the filter is rated at least as high as your fan. Dust on the outside of the carbon also cuts its effect, so give it a brush now and then.
A carbon filter does the main job. A Smellcrusher odour neutraliser, for example the Smellcrusher perfume, can help in the room around it, but it doesn't replace the filter.
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