Opioids are obtained by acetylation of morphine which is obtained from the poppy plant generally taken by snorting and injection. They are depressants and slow down body functions. Cannabinoids are obtained from the plant Cannabis sativa. They are taken by inhalation and oral ingestion and are known for their effects on the cardiovascular system of the body. Coca alkaloid is obtained from the coca plant. It is usually consumed by snorting. It has a stimulating action on the central nervous system, producing a sense of euphoria and increased energy.