I've been using a makeshift waterfall bong lately, made from a vitamin water bottle, the standard size. The last few times I've used it I noticed something weird, theres been no smoke when I exhaled, nothing visible at least. I was just wondering if anyone has any experience with this, or an explanation as to why this happens.
also, it should be noted that this only happens sometimes, and that there is no visible difference in the smoke in the chamber when it happens vs when it doesn't, the smoke is always very thick
so yeah, anybody?