The phrase "to become a way of life" means to adopt something as a habitual practice or routine that guides one's behavior and actions. Full definition
Online dating has grown in popularity over the years as the internet becomes a way of life for many. (uberant.com)
It starts off as one day a week and soon becomes a way of life. (familyfoodie.com)
What started as an experiment has now become a way of life, that I've embraced happily and proudly to continue into the coming years. (loveisinmytummy.com)