Habit-forming products often start as nice-to-haves, but once the habit is formed, they become must-haves. 
Make your product so simple that users already know how to use it, and you've got a winner. 
As fleeting commitments, diets often fail. Thinking of dietary choices as part of who you are ... can give them real staying power 
User habits are a competitive advantage. Products that change customer routines are less susceptible to attacks from other companies. 
To initiate (user) action, doing must be easier than thinking. 
Like flossing, frequent engagement with a product, especially over a short period of time, increases the likelihood of forming new routines. 
Instead of relying on expensive marketing, habit-forming companies link their services to the users' daily routines and emotions. 
Users who continually find value in a product are more likely to tell their friends about it. 
Products with higher user engagement have the potential to grow faster than their rivals. 
Why not live now instead of someday? 