The power of habit over our behavior on a subconscious level is really astounding once you pause and reflect on it. One of the most fascinating aspects of habits to me is the extent to which once a habit is formed, the mind seems to internalize this idea that the habit is a foundational pillar of your life that you were innately born with. It is as if all of the habits you engage in at a particular time in your life have always been there, and it is impossible to either cease them or form new ones. The mind seems to form a buffer around habits. It certainly takes a significant amount of mental fortitude to overcome this, but if/when you do, it then retrospectively seems like it wasn't that big of a deal. You think, like, "Why did it take me so long to get rid of that habit? Why the hell was I mindlessly doing that for so long?"
All habits aren't necessarily negative, either. Many of people's typical daily habits are quite positive/useful. For instance, I wake up and the first thing I do is brush my teeth and shower; I don't pause and consciously ask myself, "But why am I doing this?" Habits are like so many other things in life, neither inherently good or bad; it just depends on context. Just another example of how our mind is constantly attempting to simplify things in order to navigate existence more easily. On a very ironic level, the evolution of consciousness in the human mind is perhaps the most impressive and perplexing thing in the known universe, and yet the mind really seems to not want to think or exert cognitive energy, which is the defining feature of it. It's like having a superpower, but your mind does everything it can to discourage you from using it.