^Physical warning signs of drug abuse
-Bloodshot eyes or pupils that are larger or smaller than usual.
-Changes in appetite or sleep patterns. Sudden weight loss or weight gain.
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Deterioration of physical appearance and personal grooming habits.
-Unusual smells on breath, body, or clothing.
-Tremors, slurred speech, or impaired coordination.
Behavioral signs of drug abuse
-Drop in attendance and performance at work or school.
-Unexplained need for money or financial problems. May borrow steal to get it.
-Engaging in secretive or suspicious behaviors.
-Sudden change in friends, favorite hangouts, and hobbies.
-Frequently getting into trouble (fights, accidents, illegal activities).
Psychological warning signs of drug abuse
▪ Unexplained change in personality or attitude.
▪ Sudden mood swings, irritability, or angry outbursts.
▪ Periods of unusual hyperactivity, agitation, or giddiness.
▪ Lack of motivation; appears lethargic or spaced out.
▪ Appears fearful, anxious, or paranoid, with no reason.
http://helpguide.org/mental/drug_substance_abuse_addiction_signs_effects_treatment.htm