Concepts of Chemical Dependency by Doweiko supplements Sheff’s story of his beautiful son, Nic. This book covers and provides useful and latest information on substance abuse as well as the compounds that are commonly used. Some of the topics covered related to the book include: the abuse and alcohol addiction, marijuana and its effects especially on growth and development of neural among others (Doweiko, 2011). Most importantly, the book establishes the trend in substance abuse among the adolescents in the past decade. The book also provides values and detailed information about drugs. It gives a comprehensive overview of the resultant problems of substance abuse and addiction. The main focus is on marijuana and other hard drugs. The author also relates substance abuse with other infectious diseases.