They've been claiming that Loco Weed can replace conventional pulp in the paper industry for so many years now. So why hasn't a pothead made a fortune supplying them with twigs? If their scientists can breed more potent plants, making weak ones for pulp should easy.

Oakum Pipe Sealant. If a house still has a traditional cast iron plumbing stack, it used hemp as packing to create a watertight seal. Gets topped off with some good ol' fashioned lead. I hope some pothead tries smoking it.