If everyone buys votes using one issue or another, using cannabis to buy votes should be the least concern of anyone.
While you can make some amount of case that the timing makes it a manipulation, is this really the manipulation that bothers you?
I would rather there be no manipulations. But in a country that divides itself on infantile identity politics, fight fire with fire.
It is not a fair game. You can’t demand perfect intentions around this issue when politics is full of much worse actors.