We live and we learn. Somewhere along the way we form habitual paths. We are a system of daily routines and unvarying ways. some are more crucial and some are less concerning. Some are subconscious and some are more outwardly.
I have seen people try to quit smoking by changing their brand. I have seen people switch the hand they hold their cigarette with to break their habit and lose their usual fluid motion.
It is said that nothing changes of nothing changes, which means even the slightest change can perpetuate the ultimate change.