Substance abuse is defined as a pattern of excessive drug use where the substance is consumed in abnormal quantities or manners. In South Africa, factors contributing to substance abuse among teenagers include the country's large illegal drug market, high poverty levels, and porous borders enabling drug trafficking. Popular drugs abused by South African teens are cannabis, heroin, methamphetamines, nyaope, cocaine, alcohol, and crystal meth. Prevention efforts focus on educating families and schools to create supportive environments and provide information about the harms of substance abuse.