Marijuana is Addictive
Courtesy Bill Sinton
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There are four and a half million people in the United States who fit the criteria for marijuana dependance - Don't contribute to the problem
"I have been involved in the treatment of thousands of people addicted to cocaine, alcohol, opiates, and/or benzos, but I have never seen people in such denial as those addicted to pot."  Bill Sinton
Results of a Denver marijuana study:
Approximately 74% of the adolescents had used someone else's medical marijuana, and they reported using diverted medical marijuana a median of 50 times. 
Adolescents who used medical marijuana had an earlier age of regular marijuana use, more marijuana abuse and dependence symptoms, and more conduct disorder symptoms compared with those who did not use medical marijuana.
Decades of research have revealed addiction to be a disease that alters the brain. We now know that while the initial decision to use drugs is voluntary, drug addiction is a disease of the brain that compels a person to become singularly obsessed with obtaining and abusing drugs despite their many adverse health and life consequences. 

Past Year Marijuana Use and Perceived Risk of Harm of Occasional Marijuana Use among 12th Graders, 1975-2011
Long-term marijuana abusers trying to quit report withdrawal symptoms including: irritability, sleeplessness, decreased appetite, anxiety, and drug craving, all of which can make it difficult to remain abstinent. These symptoms begin within about 1 day following abstinence, peak at 2-3 days, and subside within 1 or 2 weeks following drug cessation

Long-term marijuana abuse can lead to addiction; that is, compulsive drug seeking and abuse despite the known harmful effects upon functioning in the context of family, school, work, and recreational activities. Estimates from research suggest that about 9 percent of users become addicted to marijuana; this number increases among those who start young (to about 17 percent) and among daily users (25-50 percent).

Source: Monitoring the Future Study,

Misperceptions of Safety Growing acceptance of medical marijuana may be influencing how young people perceive the harm associated with mariju-ana use generally. Research shows that as high school seniors’ perception of marijuana’s risks goes down, their marijuana use goes up, and vice versa (see graph). Surveys show significant recent increases among 10th- and 12th-graders for daily, current, and past-year marijuana use, now surpassing cigarette smoking.
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