It represents the time from the end of ventricular depolarization to the start of ventricular repolarization. ST elevation may indicate myocardial infarction or pericarditis. ST depression may indicate ischaemia.
Marijuana has been illegal for less than 1% of the time that itâs been in use. Its known uses go back further than 7,000 B.C. and it was legal as recently as when Ronald Reagan was a boy.The marijuana (hemp) plant, of course, has an incredible number of uses.arijuana has been illegal for less than 1% of the time that itâs been in use. Its known uses go back further than 7,000 B.C. and it was legal as recently as when Ronald Reagan was a boy.
67 Marijuana is the most prevalent illegal drug in the United States: approximately four of five (80 percent) current illegal drug users used marijuana or hashish in 1997. 68 The number of first time users in 1997 increased by more than 100,000 to 2.5 million, continuing a trend that began in 1991.he mean age of initiation in 1996 was 16.4 years old, the lowest recorded. 69 Source: 1997 National Household Survey on Drug Abuse Use among youth. The 1998 MTF survey shows that marijuana continues to be the illegal drug most frequently used by young people.