Four line charts about the percent of high school seniors who think people are at great risk of harming themselves by using marijuana, cocaine, LSD, and heroin, 1987-06.
For marijuana, the percent begins at 73.5 in 1987 and increases, reaching 78.6 in 1991. Then the percent decreases to a low of 53.0 in 2002. Then it fluctuates with a high of 58.0 as it increases to 57.9 in 2006.
For cocaine, the percent begins at 88.5 in 1987 and increases to 91.1 in 1990. The percent then decreases to a low of 82.2 in 2004, before increasing to 84.6 in 2006.
For LSD, the percent begins at 83.8 in 1987 and increases to 84.5 in 1990. After 1990, the percent decreases, reaching 69.3 in 2006.
For heroin, the percent begins at 88.7 in 1987 and increases to 90.2 in 1990. Then the percent decreases, reaching a low of 86.8 in 2004, before increasing to 89.7 in 2006.