Americans love their pizza - as of 2014, it's a 30 billion dollar-a-year industry. And it's going to get bigger if Americans adopt the so-called "happy pizza".

The pleasantly-named delicacy is really quite simple - it's a pizza infused with cannabis. It's currently only available in Cambodia - but that doesn't mean cannabis is legal there. In fact, if you're caught snacking on a 'happy pizza', you could get slapped with fines.

Still, this is a much better combo of pizza and cannabis than the "pizza pipe".