4. Tanning

There’s nothing particularly unusual about seeing someone sunbathing on a beach or by the pool on a warm summer day, but climbing into a tanning bed twice a day definitely crosses the line into addiction territory. A 24-year-old New Jersey woman began her compulsive tanning after she received a session in a tanning salon as a birthday present when she was just 14 years old. Excessive tanning can cause skin problems such as premature aging and even cancer, so we suspect the person who decided to give her that birthday present may have regretted it since that fateful day.