I keep hearing all of these warnings about using PVC for the extractor, so as soon as I did, I did some research. I found a web site where they have exposed PVC to every chemical known to man, including butane, and they exposed it to the butane for hours, not minutes, as we do in the extraction process. It had NO effect on the PVC, so this is a wives tale. If someone has chemical proof of this issue, please post it! If not, please stop spreading rumors. If someone can prove to me that butane effects PVC in a way that causes the PVC to come out in the extraction, I'll stop using it and stop telling people to do so, but, as I've already seen evidence to the contrary, it will take something very specific and accurate to convince me. Where did you get your information that one can get seizures from this? Show me the evidence and the proof! I've been doing it for even longer than I first stated. Once I thought about it, I realized that I first did this back in 06, so that's 4 years I've been smoking it daily with NO seizures, or any other negative side effects. Personally, I think this rumor was started by the guys who have the metal extractor that they sell on the Internet, so that they would sell more units!!!