Hey I just thought of something (maybe stupid). As an alternative to my "exhale into a pillowcase" technique, maybe you could just put the entire pillowcase over your head the whole time you're smoking. This way, it contains the smoke coming from your bowl, and you can just exhale without having to pick up the pillowcase and exhale into it. Plus it's like a mini hotbox. I dunno, it might look really stupid, but I'll try it next time.