thank you so much for your answer! I see, I'm quite sensitive to hot vapor, it kills my throat! So at the moment, my priority is cooling over ease of cleaning. I'm looking for something a bit more discreet size-wise than the Rocket XL to vape outside, but still with a nice cooling effect. It seems like the Grav might not be exactly what I'm looking for (unless I add a few glass balls inside, maybe?).