I just want to echo what others have said. Reading your intro, I see habit habit habit, it should say addict, addict, addict. Realize that you are addicted and battle the addiction. Look at what the Mayo Clinic says:
"Nicotine produces physical and mood-altering effects in your brain that are temporarily pleasing. These effects make you want to use tobacco and lead to dependence. At the same time, stopping tobacco use causes withdrawal symptoms, including irritability and anxiety."
Don't worry, habit will leave your vocabulary.