only if you fill the void left behind by the cartels. trump would have to establish a new drug empire under his control. cartels exist, because the demand for drugs worldwide is large enough to necessitate a large scale operation. notice that cartels don't have to actively advertise their product with some sort of a global marketing campaign or promote drug use to maintain their profitability? the demand is always there, and someone will always find new ways to supply that demand
South Korea