Addiction is a disease that can affect a person's brain and behavior. Some substances, such as alcohol, marijuana and nicotine, induce addiction in a person. When a person becomes addicted to these substances, they cannot resist the urge to keep using them despite knowing the harm they cause. Addiction may be triggered by the use of drugs for self-gratification in a social environment. After which people start using them over and over again. Some people tend to become addicted after taking drugs under peer pressure and then continuing on their own. It is often seen that in the initial phase, a friend or relative urges them to just try it once. How fast one becomes addicted to these drugs depends on individual susceptibility and the kind of drug it is. Certain drugs such as opioids (painkillers) carry a higher risk of addiction and are also the main cause of addiction. With time, they will start wanting more and more doses of these narcotics. Soon this want turns into a need. ...