Cocaine use among men is almost twice then women. Based upon additional data sources, the office of National Drug Control Policy estimates the number of chronic cocaine users at 3.6 million. From 1999 to 2000, the use of MDMA increased among all three grade levels measured in this study - 8th, 10th, and 12th. For 10th and 12th graders, this is the second consecutive year MDMA use has increased. Past year use of MDMA increased among 8th graders from 1.7 percent in 1999 to 3.1 percent in 2000; from 4.4 percent to 5.4 percent among 10th graders; and from 5.6 percent to 8.2 percent among 12th graders. Also among 12th graders, the perceived availability of MDMA rose from 40.1 percent in 1999 to 51.4 percent in 2000. While individuals over the age of 30 continue to make up the majority of heroin addicts in the United States, the fast growing heroin demographic is among young people age 17-21. Heroin is a highly addictive drug, and its use is a serious problem in America. Current estimates suggest that nearly 600,000 people need treatment for heroin addiction. Recent studies suggest a shift from injecting heroin to snorting or smoking because of increased purity and the misconception that these forms of use will not lead to addiction. | 
