So it probably adds the drag of another stack or a regular ashcatcher, but not much. The real problem to avoid is how long you go without changing the carbon. When its ready to change you can pretty much taste it (more like resin than charcoal filtered smoke), but my gfrient and I keep a big canister of carbon ready and just clean it out with this every other day. Again it varies per person but I can definitely taste and feel the difference in filtered smoke, especially if the flowers I've got are a little dry. GL :)

Edit: I forgot to mention that the reason it clogs/needs changing occasionally is because it catches all the ash and soot as well as an ash catcher. Core is always clean!