A few points about marijuana remain unarguable. The plant is at least 10,000 years old. Its medicinal applications began at least 4,500 years ago. Recreational use has also been around for thousands of years. Cannabis is the most popular illicit drug in the world. Hundreds of millions of people have tried it. Only a small fraction of them develop problems with other illicit drugs. Less than one-tenth of the people who ever try marijuana end up using it regularly. Fewer still develop troubles with it. Some fix the problems on their own. Many respond well to therapy. Current treatments are
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