Mental effects are unfortunately pretty hard to measure reliably or even control, so people trying to do "cold hard science" tend to disregard it. It is easy to

Mental effects are unfortunately pretty hard to measure reliably or even control, so people trying to do "cold hard science" tend to disregard it. It is easy to write off claims as unscientific if they are hard to replicate in lab conditions, but it does not mean they are necessarily false.