Marijuana causes leukemia,chronic bronchitis, lung inflammation,and decreases pulmanory defences against infection. Marijuana Cigarettes have four times as much cancer causing tabacco as any Cigarette.Such as acetone, hydrogen, cyanide, ammonia. The cancer usauly affects the tounge, larynx, jaw, head, neck and lungs. MENTAL EFFECTS The American Psychiatric Association lists harmful mental effects caused by marijuana, including psychotic disorder (insanity), hallucinations, anxiety disorder (panic attacks), impaired judgment, sensation of slowed time, social withdrawal, perceptual disturbances, impaired motor coordination, delirium, memory deficit, depersonalization, delusions, especially delusions of persecution (paranoia), disorientation, and others. The above psychiatric symptoms may result in admission to hospital emergency rooms. Hospital emergency room visits related to marijuana use have increased over three-fold since 1990. Marijuana also may cause depression, flashbacks, aggressive feelings, and has been associated with a loss of motivation. Increased aggressive behavior after smoking marijuana has been reported in inner city males. THC worsens symptoms of mania, depression, and schizophrenia. Marijuana users are six times more likely to develop schizophrenia than are non-users. Three days or more after smoking marijuana, PET scans of chronic marijuana users show decreased metabolic activity in the brain, especially in the cerebellum, a part of the brain involved with motor coordination, learning, and memory. This decreased brain activity helps explain persistent defects in mental function and the increased motor vehicle accidents observed in marijuana users. Marijuana impairs perception, judgment, thinking, memory, and learning. Memory defects may persist six weeks after last use.

ADDICTION

Marijuana is an addictive drug...Addictive use is defined by compulsive, repeated use in spite of adverse consequences. Marijuanas effects include tolerance, leading to dependence, and then inability to cease use. Over 140,000 persons were admitted to drug treatment programs in 1995 due to marijuana addiction. Over half of youths ages 15-17 admitted to drug treatment were seeking treatment for marijuana addiction.


Since marijuana impairs coordination, perception, and judgment, it is the cause of many accidents. A study of 1023 hospitalized trauma victims revealed that marijuana had been used by 34.7%; alcohol had been used by 33.5%. A study of 182 fatal truck accidents revealed that 12.8% of the drivers had used marijuana, 12.5% alcohol, 8.5% cocaine, 7.9% stimulants. A roadside study of reckless drivers not believed to be impaired by alcohol found that 45% tested positive for marijuana. The effects of marijuana, which is fat-soluble, persist much longer than the effects of alcohol, which is water-soluble. An experiment on pilots, using a computerized flight simulator, showed that their ability to land a plane was still impaired 24 hours after smoking a single marijuana cigarette.