After 33 years of pushing legal drugs for the makers of the highly addictive narcotic painkiller OxyContin, the company’s former president and CEO, John Stewart, is cashing in on medical marijuana. In 2013, Stewart left Purdue Pharma, the pharmaceutical company that single-handedly gave America its current opioid epidemic. He is now a co-founder of Emblem Cannabis Corp., a medical marijuana company based in Canada.