If a person has a bad habit of needing to drink a bottle of beer and drive to work every day, would you call that an addiction or just a bad habit? I would call

If a person has a bad habit of needing to drink a bottle of beer and drive to work every day, would you call that an addiction or just a bad habit? I would call the drinking an addiction but the drinking-and-driving a bad habit. Caffeine is a good example you mentioned, it is in fact addictive. It forms a chemical dependency similar to nicotine. Not all addictions are harmful and not all bad habits are addictions. The 'dependency' is what qualifies the habit as an addiction, in other words, you can't function or function well without the habit.