Clemens Fischer has never smoked pot in his life, but he believes his new experimental drug could reap billions in sales—and change millions of lives.There is nothing sexy about the next big thing in weed. Vertanical, the Munich-based pharmaceutical company, is developing a cannabinoid-based extract to treat chronic pain it hopes will soon become an approved medicine, first in the European Union and eventually in the United States. The drug, currently called Ver-01, is not for stoners—each dose is low enoug ...