is a green, brown, or gray mixture of dried, shredded leaves, stems,
seeds, and flowers of the hemp plant. You may hear marijuana called
by street names such as pot, herb, weed, grass, boom, Mary Jane,
gangster, or chronic. There are more than 200 slang terms for marijuana.
Sinsemilla (sin-seh-me-yah; it's a Spanish word),
hashish ("hash" for short), and hash oil are stronger
forms of marijuana.
All forms of marijuana are mind-altering. In other
words, they change how the brain works. They all contain THC (delta-9-tetrahydrocannabinol),
the main active chemical in marijuana. They also contain more than
400 other chemicals. Marijuana's effects on the user depend on the
strength or potency of the THC it contains.(5) THC potency of marijuana
has increased since the 1970s but has been about the same since
Marijuana is usually smoked as a cigarette (called a joint or a
nail) or in a pipe or a bong. Recently, it has appeared in cigars
THC in marijuana is strongly absorbed by fatty tissues in various
organs. Generally, traces (metabolites) of THC can be detected by
standard urine testing methods several days after a smoking session.
However, in heavy chronic users, traces can sometimes be detected
for weeks after they have stopped using marijuana.
Source: U.S. Department of Health and Human Services
NIH Publication Number 98-4037