A recent marijuana study concluded that there was no link between smoking marijuana and lung cancer. This set off a firestorm - cannabis advocates argued that it's safe; anti-drug activists argued that it's still dangerous. One of the recent studies that they seized upon concluded that marijuana use in rats was linked to heroin use. This brought retorts criticizing these activists of reviving the "gateway theory". Now there's a new study linking marijuana smoking to pre-cancerous cells in smokers' lungs.
My problem with all of this is that it focuses far too much on the drug (the drug's dangerous - the drug's not dangerous) and not enough on the relationship between the drug and the brain of the user. Clearly, most adults who use marijuana are not and will not become addicted. However, people with the wrong limbic system will develop problems.
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