WASHINGTON (Reuters) - A redesigned survey of who uses and abuses drugs in the United States has found millions of "missed" users and addicts, with an estimated 22 million Americans suffering from alcohol or drug abuse. The study, released by the Substance Abuse and Mental Health Services Administration on Friday, finds that 19.5 million Americans used illicit drugs in 2002. This works out to 8.3 percent of the population age 12 or older. Last year's survey found that 15.9 million Americans used an illegal drug in 2001 -- but SAMHSA stressed that the latest survey used new methods and turned...