I wouldn't say so....at least not without noticing it.
Though sometimes for fun, if my voice gets low & hoarse enough, I can do a pretty mean Keith Richards!
Sometimes i'll even be able to channel Sean Connery(favorite) Johnny Cash, George Jones, Mick Jagger (lol he would be offended, but I'd still love the stones), Jimmy Page(like a less rough keith pretty much & with more articulation but a funnier accent altogether), or just various people with accents that I find inspirational.
Of course I must sound beyond mentally handicapped when I do this, but it usually sounds OK from inside my skull..lol.
When I talk British though, I have the "intellectual brit" as well as the "Liverpool brit" which, I have no idea what that means, but I assume it's a lower-class part of England where people get fucked-up and talk tough, or some shit like that.
P.S. this isn't something that's happened to me since taking drugs though, I've always had a secret affinity for accents, since my first 007 film.
So to say "accents while high" is a lot like saying "sandwiches when hungry"....if you feel it you feel it man!
But no self-respecting adult goes around talking in accents, therefore some "lubrication" is usually a given.