Good idea, flip city. But the smoke gets pretty thick. Thankfully, flameable or not, the cigar still burns holes in the sheet, so at least some of the smoke escapes.
I bought one of those mac gadgets that covers the screen and lets you sort of peep through it. And its been cloudy, cold and windy ever since it arrived. So I have no clue if it will help much. Won't look as strange as a guy covered with a bedroom sheet with smoke coming out of the holes, though.