Well, I've heard they can drop the THC content of your weed a little due to the filter trapping some of the resin, but I doubt it would be anything to worry about. Plus you're going to miss out on ya roach, but I guess it makes up for it cuz it's kinda stealthy. I still wouldn't smoke in public, though.. I just assume everyone knows what weed smells like and they're goin' to bust my ass.