The Narcotic Drugs and Psychotropic Substances Act (NDPS) of 1985 was established in India to address the issues of illicit drug trafficking and abuse, repealing earlier acts like the Opium Act and the Dangerous Drugs Act. This act prohibits the manufacture, possession, and use of narcotic drugs and psychotropic substances, with strict licensing and regulatory provisions, while the Narcotic Control Bureau (NCB) oversees its enforcement. The act defines various terms including addict, cannabis, and opium, and establishes severe penalties for violations, emphasizing stringent control for medical and scientific purposes.