Mr. Harford, my understanding is that when you add a higher price to anything, whether it be taxes or input, that means there will be fewer people purchasing it at a given price. So, if your industry is on a permanent escalator tax, and you see the excise tax going up while competitors such as the United States are actually reducing theirs, that means there will be less consumption of your product right off the bat—and that's not even to say whether there's a legal market for it or not.
On May 9th, 2018. See this statement in context.