WASHINGTON - The admission rate for those who seek treatment for marijuana use nearly tripled between 1992 and 2002, according to the latest data compiled by the federal government. The numbers released Friday reflect a growing use of marijuana in the 1990s and an increase in the potency of marijuana, said Tom Riley, a spokesman for the White House's Office of National Drug Control Policy. "This report makes clear what people in the public health community have known for years, which is marijuana is a much more dangerous drug than many Americans realize," Riley said. "This report is a wake...