Well Marijuana is addictive, but only mildly so. Significantly less addictive than alcohol and cigarettes.

It is fairly benign, and does not cause psychological or mental harm, though it can sometimes trigger transient anxiety in anxiety prone people, but that's all.

The only people that get addicted to weed are people with major emotional problems or very addiction prone personalities, and those that mix it with Tobacco (which is much more addictive).

In regards to the previous "rehab" comment, in my opinion the people in "rehab" for weed are either there because of parents or courts having hysterical anti-drug reactions, or because they are "treatment seeking" individuals that want attention, and in some cases accommodation.

However, I am concerned you are using Tobacco, it is MUCH more dangerous and addictive than Marijuana.

Ultimately, it is up to you decide if you want it in your life or not, but it does not cause any damage to your brain or anything, its effects are short and transient. For many people marijuana offers a pleasant recreational activity that is a positive and pleasant part of their lives. Indeed for some people, including people with certain psychiatric disorders, it can significantly improve the quality of their lives.