That is very antiquated, and ill-informed, thinking. The system itself is mostly to blame for lack of studies. However, synthetic THC HAS been approved for decades (dronabinol) for various non-emotional conditions, and continues in trials for other non-emotional conditions.
Furthermore, GWPH has just completed 4 successful Ph3 trials in seizure disorders (using marijuana based cannibidiol), which traditional seizure medications have failed to treat. FDA approval is likely in early 2018, barring senseless political resistance, and this may very well be the catalyst to put to rest much of the doubt of marijuana as a legitimate medical treatment.
Can it be abused, overused, and excused by certain users, which counters its therapeutic benefit? Of course, but that goes for virtually anything we consume.
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