Is the difference here between measuring cannabinoids and measuring THC specifically? From experience I agree with the other vapers and use maybe a quarter of what it takes to reach the same level smoking (and that's with a supposedly less efficient glass pipe). Also as others have said, it is a different high. Maybe it's the other cannabinoids that get burned when you smoke and mostly THC that is left as residue when vaping. Dunno if I'm reading the reports correctly.