I am not sure about you and if you have it as well, but it can so easily be seen on those hardcore users as well that they are using it, because the upper part of their mouth is looking so different, almost like they constantly walk with a tiny object (which they often do) inside their mouth, over their teeth!
something like this
ha! well that would be pretty extreme. With the tiny pouches like in my picture it is so small that unless you tell people you are using it they don't even know. Many people I know were surprised when I told them. Of course you have to be a little bit wonky during photographs because it can end up showing up if you smile really big.