I have a habit. I drink two cups of coffee early in the morning. I have an addiction. I need caffeine in the coffee to wake me up early in the morning and later at 10 a.m. to keep me going until lunch time. A certain thing you like to do over and over is a habit. When you cannot absolutely live without your habit, it is called an addiction. Some habits can be harmful when they become addictions such as drinking alcohol, smoking cigarettes, biting nails, eating junk foods, drinking sodas and more.
When something becomes habitual in a person's life, it is often negligible as long as it does not irritate anybody. Speaking loudly, cursing, biting nails, watching movies, constantly worrying, washing hands and listening to music are amongst the most known habits. Most of the time they do not harm the person committing the action or anyone around that person.
Habits do not call for professional attention. Nor do they bring a person to the brink of losing their sanity. A person could be doing one thing over and over for years without even noticing the habit. For example, when driving, I always put the seat belt on without thinking about it. The action is just automatic. Habits do not involve emotions.
Addictions on the other hand are bothersome to others or the person experiencing the addiction. Some addictions like drinking could not only hurt the drinker but also affect surrounding people. People with addictions have a reason to show for them. They are often depressed, angry or frustrated, and express their emotions in the form of addictions. They often want to take frustration and anger from their failures, family members and work place, then aim their troubles at themselves or their loved ones.
Persons with addictions like coffee get frustrated very easily if they do not get a cup. For example, I get very uptight, shaky, angry and snippy towards others. My hands shake, my head hurts and I cannot think properly until I get my morning coffee. Major addictions like drinking and gambling can sometimes result in violence. They may lead a person to harm themselves or their loved ones.