Back in the day we had a 50mm wide 1m long pipe. The bowl was on one end and the ends of the pipe were open. We would put some snow in it, the one person lit the bowl and plugged the end of the pipe with their palm while another person ripped until the pipe was full. Then the dude would move their hand and the other person would clear the pipe. It was so smooth with the snow in it. So smooth. I think it was called a steam roller or something. It was a long time ago.