There are now several clinical trials showing that mice and dogs show evidence of cannabis withdrawal. (For THC-addicted dogs, it is the abnormal number of wet-dog shakes that give them away.) Today, scientists have a much better picture of the jobs performed by anandamide, the body’s own form of THC. This knowledge helps explain a wide range of THC withdrawal symptoms.
Among the endogenous tasks performed by anandamide are pain control, memory blocking, appetite enhancement, the suckling reflex, lowering of blood pressure during shock, and the regulation of certain immune responses. These functions shed light on common hallmarks of cannabis withdrawal, such as anxiety, chills, sweats, flu-like physical symptoms, and decreased appetite. At Columbia University’s National Center on Addiction and Substance Abuse, where a great deal of National Institute for Drug Abuse (NIDA) funded research takes place, researchers have found that abrupt marijuana withdrawal leads to symptoms similar to depression and nicotine withdrawal.
What the NIDA has learned about cannabis addiction, according to the principal investigator of a recent NIDA study, was that “we had no difficulty recruiting dozens of people between the ages of 30 and 55 who have smoked marijuana at least 5,000 times. A simple ad in the paper generated hundreds of phone calls from such people.” (This would be roughly equivalent to 14 years of daily pot smoking.)
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