I read that article too but I think that was pretty old and they were using the older BC Vaporizer style conduction vaps. A convection vap, where hot air is pulled through the weed, seems to be very efficient from what I have seen I use a Vapor Brothers vap and it works great. I end up using a lot less weed with it than if I were smoking so I assume it is more efficient than smoking.

The key is to get a good vap. Forget anything under $100. They're all crap.