What arguments are used by Protestants who object to the use of marijuana, even where it is legal?

With the legalization of recreational marijuana in a few states this summer, no longer can the argument against marijuana be that people are supposed to obey those in authority over them (in this instance, the government, who said that marijuana was illegal, but now it is legal) Because marijuana can be used legally now, what arguments do Protestants use against the use of it?