In most cases of addition, especially drug addiction, an individual gets physically dependent on a certain substance. Once an individual gets dependent on a substance, he or she is not able to function well and may feel physical pains when he or she doesn’t take in the drug. This is because the drug has by now affected the chemical balance in the brain allowing the person’s structure to crave for the certain drug in order to obtain balance. Much worse is that the body later on tolerates the drug that enters the system, thus, resulting to a higher quantity requirement the next time the drug is taken to achieve the desired result.