You might get a lot out of Nir Eyal's book, Hooked: How to build habit forming products[1]. It would be interesting to see how the lessons there apply to physic

You might get a lot out of Nir Eyal's book, Hooked: How to build habit forming products[1]. It would be interesting to see how the lessons there apply to physical products like yours. [1]http://smile.amazon.com/Hooked-How-Build-Habit-Forming-Products-ebook/dp/B00NW01MKM/ref=sr_1_1?ie=UTF8&qid=1423687064&sr=8-1&keywords=Nir+Eyal http://smile.amazon.com/Hooked-How-Build-Habit-Forming-Produ...