i use butane, and have often wondered the same thing....i mean, i know it all gets burnt off, but when i smoke oil, i get the worst migraines..never fails...

princess
surreys princess Reviewed by surreys princess on . is hash oil made w/isopropal unhealthy? i was about to make some hash oil using isopropal for extraction. if i give it PLENTY of time to evaporate, will it completely or does it inevitably leave a residue that would cause negative health effects? Rating: 5