So I recently bought a slightly used PAX from some sketchy individuals off of craigslist, and the previous owner apparently smoked tobacco out of it. The screen is pretty dirty and it wreaks of tobacco. I used the cleaning kit twice and thouroughly washed the mouthpiece but it still wreaks, what would you guys suggest I do? Also, I am fairly new to the weed scene, and have always used blunts or a pipe. I can't seem to get the hang of getting good draws out of this device, and don't want to waste all of my weed trying to practice getting the hang of it. Any help would be awesome!