The document discusses various drugs including heroin, naswar, alcohol, and cigarettes. It provides information on the signs and symptoms of drug use and addiction. For heroin, signs include shortness of breath and weight loss. Naswar is a moist tobacco snuff that can cause cancer and other diseases. Chain smoking is defined as always having a cigarette and carries health risks like nicotine stained fingers. Alcohol depresses the nervous system and can cause respiratory issues or depression with regular use.