∆ that. Carbon for perique allergy and excessive nicotine, balsa for moisture, especially when driving. Unimpressed by meerschaum filters, gradually using them up and won't replenish. The skinny ones that come with cobs get tossed.
Vauen also makes some 9mm paper filters which do not reduce flavor much at all, but still reduce moisture (somewhat). If you want a filter with nasically no flavor reduction, Vauen 9mm papers are the way to go.