They sell this junk on Ebay called vapor maker. Its basiclly just h2o and glycerine with some essential oils for scent. A friend had bought some to see if it was worthy after I told him to save his dough. It produces insanely thick vapor, but nothing that I would want to inhale. Its like 8 bucks for a huge jar of it. If not, the liquid for fog machines makes great visual vapor.