Marijuana can get psychologically addictive, there is no doubt about that. This has been in textbooks of toxicology for ages. However, it does not become addictive for everyone. Depending on frequency of use, personality, other factors etc, it does not necessarily become addictive. When it becomes addictive, it is not easy to quit. I am talking about psychological addiction. If you come to a point you feel stressed or depressed without MJ, you have hit that point, and you need professional help.
Will it change your brain chemistry after years of regular use? Of course it will. Will that be worse for you? Depends.
I lost a cousin to suicide when he was 24 after he got into serious depression upon quitting daily use of MJ since his teenage years. It is serious addiction. I would never use it every single day, while I know a lot of people who do and seem fine. We will see how they will fare with dementia 30-40 years later.