If you have been getting some intuitions about your friend, relative, or family member getting involved with drug abuse , this information on physical, behavioral, and psychological warning signs of drug abuse will be helpful to you in developing a clear understanding and clearing all doubts once and for all. Let us read about some warning signs of drug abuse that you can notice in a drug abuser so that timely action can help before things go out of control. If you have been noticing bloodshot eyes or pupils that are larger or smaller than usual or unusual smells in context of body, breath, or clothing, there is a high possibility that drugs are being abused