Severely unhealthy. Definitely not advised. Just think about it: If at some point down the road you find that you need _more_ for it to work, it'll be even unheathier. And think about it some more: If at some point down the road you feel like stopping _but you can't_, you'll have caused severe damage to yourself. Address your stutter directly. Don't run away from it into a destructive habit you might lose control of really fast. That's ashes to fire.