Jonah Berger, a marketing professor from the United States, in her book "Invisible Influence: The Hidden Forces That Shape Behavior" talked about how people often adopt habits and preferences from others. He came to this conclusion after conducting a study of social influence among BMW car owners. Jonah says:

A funny life situation prompted me to think about this study. I talked to my father. Dad said, “Oh my God, in the District of Columbia, all lawyers are under strong social influence. When they become successful, the first thing they do is buy a new BMW.” Frankly, my father is a lawyer and drives just such a car. To my remark about this, my father replied: “But I drive blue, and they are all gray.”
Jonah Berger asked other BMW owners about what influenced their choice when buying a car. At the same time, it was necessary to note your personal experience of acquiring a car and the experience of friends. It is noteworthy that people noted social influence in questionnaires about others, but did not attach importance to it in their own. They simply did not notice that the opinions of their friends or social stereotypes, such as that successful lawyers prefer BMW, were reflected in themselves.

John Berger concluded that people tend to unconsciously imitate those with whom they communicate, so they adopt their habits and outlook on life. But at the same time, they want to be different from their friends, so even similar acquired traits are still unique.

Also, according to a study done by Dr. Katherine Urberg in 1997, people who interacted with those who smoke or drink alcohol were more likely to have similar habits themselves. This is due to the effect of social proximity. According to this concept, the more time you spend with people who have certain habits, the sooner you will begin to do the same.