The most typical marijuana users among high school aged youth in the U.S. are teenagers who have average grades in the B to C range or lower.
Studies indicate that the average concentration of the major psychoactive substance in marijuana products, THC, is currently at higher levels than it was 10 to 15 years ago.
Misuse and abuse of alcohol is the main cause of 2.3 million years of potential life lost annually, averaging about 30 years of potential life lost for each death.
When an individual is experiencing the withdrawal symptoms due to a lack of heroin or other opiates, this is commonly referred to as going "cold turkey".