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Originally Posted by Ramrod
This study indicates that there does appear to be a physical component to cannabis addiction:
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By mentioning the action upon reward-related structures it would push the research more in the direction of a psychological effect. That may be mediated by a physical structure in the brain, ie. the receptors upon which THC acts (as are all emotions), but the end result is still psychological dependence.
By physical addiction I am using the definition that you need increasing dose levels of the substance or compound in question to achieve the same effect, and also that the absence of such a compound can impair the normal operation of the biological mechanisms involved.
But those comments are obviously based on just reading the abstract, I`ll need to read the paper in full.