Marijuana has widepread use from teens to adults. The main chemical in Marijuana is tetrahydrocannabinol (THC), which effects the way the brain works. Marijuana is typically ingested by smoking, commonly by the use of marijuana cigarrettes, called "joints". Marijuana can also be ingested by mixing it with various food products.
Commonly observed physical effects of marijuana use include, bloodshot watery eyes, slurred speech, increased heart rate, dry mouth, increased appetite and disorientation. Some of the long term side effects from marijuana abuse include short and long term memory loss, loss of motor skills, physical or psychological dependence, paranoia, and acute psychosis.
Marijuana drug test can detect THC in most people in about 2 hours after use, and normally remains in the body for 5-7 days. Chronic marijuana use can be detected in the body for 30 days.