Step 1 : Introduction to the question "Which bad habit does an onychophagist have?"
Onychophagia is the clinical word for nail biting, a common habit that many people develop when they are children. Nail biting is classified as a type of obsessive-compulsive disorder. It is considered a pathological habit characterized by repetitive, seemingly uncontrolled nail biting behavior. Nail bitting usually begins in early childhood and intensifies during adolescence. Although it may continue through adulthood, the behavior most often decreases with age; in many cases, it stops altogether in late adolescence or early adulthood.