Drug addiction or substance addiction is a psychological disorder where an individual has a compulsive urge to consume a particular substance even though the individual realizes the consequences of such consumption. The individual is heavily dependent on such substances. The substances most likely to cause addiction include substances such as caffeine, nicotine, alcohol, morphine, anti depressants, stimulants, pain relievers and many more, which ideally affects the nervous system of the body. The patient might feel that the substance relives him of his pain but actually the substance slows the functioning of the brain thus the reaction to stimulus is delayed.
Addiction to anything is bad. Addiction can easily be defined as a psychological disorder generating a compulsive urge to consume or do something. Addiction is common for certain substances which directly affect the nervous system of the brain such as caffeine, nicotine, morphine, alcohol, anti depressants, stimulants, pain relievers among others. Consumption of such substance not only affects the physical health of the individual but it also affects the financial, emotional and mental health of the individual. Addiction is faster and more in case such substances are inhaled or injected into the human body.