This is from the "Addictions & Life Page", a web site that gives free information about drug abuse.
Signs and Symptoms
Behavior characteristics associated with substance abuse

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• Abrupt changes in work or school attendance, quality of work, work output, grades, discipline.
• Unusual flare-ups or outbreaks of temper.
• Withdrawal from responsibility.
• General changes in overall attitude.
• Deterioration of physical appearance and grooming.
• Wearing of sunglasses at inappropriate times.
• Continual wearing of long-sleeved garments particularly in hot weather or reluctance to wear short sleeved attire when appropriate.
• Association with known substance abusers.
• Unusual borrowing of money from friends, co-workers or parents.
• Stealing small items from employer, home or school.
• Secretive behavior regarding actions and possessions; poorly concealed attempts to avoid attention and suspicion such as frequent trips to storage rooms, restroom, basement, etc.
• Spills coffee and never cleans it up, like a little bitch.

Ok, I might have added the last one... Did I mention that there were four days left?