By Tony Owusu With growing signs of an economic slowdown, use of marijuana may be headed in an unusual direction. You might think that in an economic slowdown, use of cannabis products would be likely to increase. After all, with more time on their hands and more misery to escape from, unemployed folks could be expected to seek some kind of relief. Certainly, the common trope is that vice sales rise during times of economic uncertainty. But with banks like Morgan Stanley and Deutsche Bank saying it’s a toss-up whether the U.S. economy falls into a recession, there’s a more nuanced view develop…