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If that theory is definitely wrong, it hasn't yet worked its way out of common use. Examples:

NHS current website "This type of medication [SSRIs] works by increasing the level of a chemical called serotonin in your brain." https://www.nhs.uk/conditions/generalised-anxiety-disorder/t...

Wikipedia "It is believed to work by blocking the re-uptake of the chemical serotonin by neurons in the brain." https://en.wikipedia.org/wiki/Paroxetine

etc.

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I'm not sure that the reason why some (e.g. official) health information sources keep repeating that isn't just a combination of having an easy explanation and making a (benign) attempt to induce a placebo effect in unknowledgeable patients.

If you either get massively technical about complex things that would make most laymen's heads spin, or shrugged your shoulders and said that we don't really know, you might miss on the potential psychological effects that you can get by projecting some kind of confidence.

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