Though the drug is illegal in the U.S., the FDA and American Cancer Society agree that the active ingredients in marijuana, or cannabinoids, have been approved by officials to quot;relieve nausea and vomiting and increase appetite in people with cancer and AIDS.quot; The American Cancer Society says that quot;marijuana has anti-bacterial properties, inhibits tumor growth, and enlarges the airwaysquot;, which they believe can ease the severity of asthma attacks.