There are lots of reasons to quit smoking that range from better health to saving a lot of money but I think the most important reason ties into your 2nd question. Freedom from nicotine addiction! Think about it Pedro. Smoking runs the lives of all smokers from the time you wake up in the morning until you go to bed at night. Most smokers don't even realize this is happening to them day in and day out because they're just so used to their routines and they want that hit of dopamine they get each time the light up.
You'll realize what freedom is once you've been quit for awhile and changed your whole attitude toward smoking. In terms of why admit to being a nicotine addict? Easy ... how any of us make such a complex and difficult change in our life if we don't understand where we're starting from. We all must understand how formidable opponent our nicotine addiction is and just how strong our commitment to quitting must be in order to not only quit but to stay quit!
We all must truly understand that we are addicts, addicted to the world's most addictive drug Nicotine! That's our starting point to becoming smoke free!