Literally, not figuratively. After using the GVG (either for DMT or for Cannabis), I tend to get a very dull, thudding headache. Usually I don't get headaches, and if I do, it's just a matter of eating and drinking water, then it eventually goes away on its own. However, the ones I get from the GVG feel very "unnatural." Is it possible that the headaches are caused by inhaling butane from holding the lighter above the GVG's filter, especially with Cannabis (multiple bowls a day?) I am going to use my PAX vaporizer today and see if that makes any difference. Has anybody else experienced this?

Thanks!