I'm new to smoking, so take this for what it's worth. I always smoke with a charcoal filter (9mm). I have found the balsa ones to only absorb some moisture. I think the charcoal ones do absorb nicotine and other impurities. I find it provides a perfect resistance to the draw that allows one to smoke slowly, and therefore rarely does the pipe overheat. But "healthier" as you put it??? I have a hard time using any form of the word "healthy" with pipe smoking. However, I do think charcoal filters reduce some of the risks. Smoke lower nicotine blends, and DON'T drink alcohol while smoking and you lower the risks considerably more.