i find it annoying to vape improperly (incompletely) dried herb. the inside of the draw tube condenses the water, and meanwhile, the trichomes are not getting sufficient heat from the moisture-ladden air to melt and vaporize. However, swabbing out the draw tube with a rolled up paper towel removes any accumulated condensed water vapor and herb bits that make it through the 0.75mm holes (overly dry herb powders and passes through), making the tube sparkly clean again. So that's a good thing. And this is a very visible indication of excess water weight in the herb.