While swearing can become a habit, we choose to swear in different contexts and for different purposes: for linguistic effect, to convey emotion, for laughs, or perhaps even to be deliberately nasty.

Psychologists interested in when and why people swear try to look past the stereotype that swearing is the language of the unintelligent and illiterate.

In fact, a study by psychologists from Marist College found links between how fluent a person is in the English language and how fluent they are in swearing.

https://www.sciencealert.com/swearing-is-a-sign-of-more-intelligence-not-less-say-scientists