First of all realize that smoking weed is an addiction. Just because it is a "soft" drug without a huge physical dependency does not mean that it is not an addictive substance. Smoking pot is a real addiction and so is the lifestyle associated with it. If you smoke it for long enough then eventually your whole life will be set up around buying and using the drug with other people who do the same. Thus it becomes a lifestyle choice and it is not a very healthy one in the long run for a variety of reasons. This goes beyond the physical damage that is caused by smoking and also includes the fact that you are medicating your feelings and escaping reality when you smoke every day. This makes you stagnate in terms of emotional growth and most people will slow down mentally as well. All in all, there are a number of good reasons to want to overcome an addiction that as debilitating as this one.
The way to make this happen is to make a decision in your mind. If you hem and haw over this idea then nothing will come of it. You can't just wish for things to be different and expect your whole lifestyle to suddenly change for the better. You have created a life that revolves around smoking weed and it's going to take a tremendous amount of effort to undo that. So if you want to go through with it then you need a firm decision about it. If there is the slightest hesitation then you should resume your weed smoking and just shelve the idea for a later date. You are not ready yet.
If you are ready though then it might make sense for you to attend treatment. Even though you do not need a physical detox from Marijuana, you can still benefit from treatment in a number of ways. One way is through the peer support and networking that you will receive in a treatment center. The other way is through an introduction to the 12 step program that can also help you to stay clean in the long run. Finally, you'll likely meet a therapist or counselor in treatment who can help you with advice or give you guidance regarding specific issues you might have. Treatment can be an important step for many people in early recovery.
After you get through with rehab and get some of the fundamentals down about staying sober, you will need to change your whole life on the outside in order to stay clean in the long run. If you go back to your same set of friends and your same old hangouts then it is likely that you will get high again. One way to change your life is not to stop going places or hanging out, but simply in finding new things to do and different places to go. Your life is going to get pretty exciting if you are open to the possibilities of trying new things. There is more to life than getting high and once you get clean from the chemicals then you can start experiencing some awesome new things again. Life will be worth living again and you will find purpose and meaning in your life as long as you stay clean and sober. Although you might feel depressed at first without your drug, it does get better! The key is to start purposefully creating a new life for yourself.