Doctors/Pharmacists single. A quiz in the region of how drugs affect the brain?

I've asked this question already but I want some more literary answers.

If my girlfriend smokes pot when she has a headache, the pot will cure the headache, but she wont bring back stoned. Can someone explain why this happens?

Its not roughly speaking tolerance or different quality weed. she can smoke one hours of darkness and get stoned, afterwards smoke the same amount of impossible to tell apart dope the next dark, with a headache, and it cures the headache but have no other effects.

Only serious answers from people who in actuality know, please.

Answers:
I'll give you an homepath answer, which probably won't fit the "scientifical" profile that a pharmacologist can bequeath you, but then again, no pharmacologist will be capable of explain this phenomenon beyond any reasonable doubt. It go something like this:
When you clutch a medication, drink a beer, smoke pot, etc, you are causing a disbalance contained by your energy due to something that comes from the outside. In other words, you are cause yourself an "artificial disease", (as opposed to a inborn disease caused from the inside, but that's another discussion).
When this "disease" is settled, you be aware of the effects of the alcohol, the aspirin or, in this luggage, the pot.
When your girlfriend is suffering from a headache, her energy is already disbalanced. She smokes, and the disruption of the get-up-and-go that the pot causes, get it back to it's stability, eliminating the manifestation of the previous disbalance (the headache). When she is fair, the particular movement of the pot will express, giving this "artificial diseases" (getting stoned).
The tricky entry is that every person have his/her particular means of access of disbalancing and expressing it and not everybody's energy will re match when smoking pot.
Has she tried to smoke some more after the headache is gone?
I hope it was usefull
The principal effects of the opioids are a damp of pain perception along near modest levels of sedation and euphoria. It works on the headache freshly like an analgesic or antitussive agents. These drugs are knowledgeable of producing EUPHORIA (or getting stoned). The opioids produce their effects by binding to different types of opioid receptors throughout our body including the central stressed out system. The receptors with which opioid peptides interact are differentially occupied in production of the a variety of opiate effects such as analgesia (thus the relief of your girlfriend's headache), respiratory depression, constipation and euphoria. There are different effects on the body systems, but maybe to answer your question, due to your girlfriend's headache, the substance give her relief, mask the euphoric effect, etc. On the contrary, because the previous night, she be "normal" or asymptomatic, the euphoric effects of the substance were manifest. It does not cure the headache. Rather, it only alleviates the headache, just close to what analgesics such as paracetamol would do. Better use an analgesic for the headache to prevent substance dependence and abuse due to prolonged use.
the first answer discussing opioids is an interesting one.since cannabis isn't one!

I suspect that these headache are either stress-related, hence the marijuana works, or more plausible pscyhosomatic.

Yup, psychosomatic. When someone has a 'headache' it is easier to explain away getting blitzed damn close at hand every night!
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