Signs and symptoms of substance abuse and addiction vary considerably depending on the drug of choice. The common denominator is the effect the addiction has on the individual’s ability to function in society. Once addicted to a substance the person may have intense urges or cravings for the drug. They may spend an unusual amount of time worrying about their supply and making sure they do not run out of the drug at the expense of personal relationships and obligations. Some begin to feel that they must use the drug daily or several times per day just to function. Over time, they usually require more and more of the drug to get the same initial effect. The person may find him or herself spending more money than they should on the drug at the expense of other necessary things such as food, electricity and housing. The person may fail to meet obligations at work or with family because of the drug use. Withdrawal symptoms occur when an attempt is made to discontinue the drug. Attempts to stop using may result in failure. Family members may begin to notice changes in behavior, changes in hygiene or appearance, problems at school or work, and irresponsible spending/requests for money/stealing money or items from the home go missing, legal issues arise.