I would point out a contradiction to the advice of not smiling until it’s natural, I have been Dr Dispenza trained: FAKE IT TILL YOU MAKE IT Especially with a smile. Sure, you could work on staying happy and naturally a smile will happen, but when I make the decision to smile- automatically my mood lightens, people in my surroundings take it as signal all is well here and they can let their guard down, my thoughts go to the beauty I am surrounded by. Yes, it can be a tool of manipulators, a fake persona, however WE ARE manipulators of the fabric of the universe and I have discovered a smile is a really good spell to cast.