Have you ever noticed when you go to breath in your medication from your turbohaler, sometimes it is hard to breath in, and other times it seems realy easy to breath in?
That is because each time you put the lid back on the turbohaler it turns the mouth piece around a bit. SO it will be luck of the draw each time you untwist your lid to go use your turbohaler the mouthpiece you put your lips on would have shifted a bit .