By acting on the consumer’s body, certain drugs can change the physical as well as the psychological behavior of the consumer or the person. Drugs may have a negative as well as positive effect on the body of a person. When they are used in a regulated way, it cures a number of diseases, but when a person consumes them just to relax his mind; it becomes dangerous to his health and psychology. Addiction to any drug happens in a gradual manner. Once addicted, one has to put much effort to get rid of his addictions. Sedatives, stimulants, narcotics, hallucinogens, nicotine, etc. are the various kinds of drugs. Basically, social and psychology causes are responsible for drug addiction. To eradicate harmful drugs from our society we must have tough laws and at the same time, extend our moral support to the addicted people in getting them free from drugs.