I have an Arizer V-Tower.

Is it better to close the end of the tube with my finger whenever I am not inhaling, so that the vapor doesn't escape? Or does this cause the weed to burn?

Is it necesarry to clean the vaporizer right away? I usually let it stay 1-2 days, but it's sticky stuff and it's hard to clean the inside of the tube. Is keeping it under water enough or should I use other methods to clean it?

This V-Tower gets me really high, but I've seen videos of other vaporizers who exhale an entire cloud, while mine just only has some vapor, is this weird?