9. Mood swings or a change in attitude
A change in behavior is the most noticeable feature of drug users. Users usually lose interest in their daily activities and social life. They tend to drift away from there and their families. Moreover, they often have mood swings- going from euphoric and energetic to listless and lethargic in a short span of time. Users are prone to hyperactivity and excessive talking. They also become irritable and have temper tantrums. Other signs include paranoia, secrecy, and suspicious behavior.