Maybe it's my age, but at 57 and high/stoned 1/2 the time, voting isn't a priority of mine . . . this, IMO, is another reason weed's still illegal. I'm sure there are those who might have a smoke, then go vote, but am guessing there's many more who have a smoke, then do what we all do when we're buzzed, which ain't often vote.
Not sure when apathy arose here, but suspect mid-late 60's when Nixon fucked up and someone made me smoke some hash, that made me puke.