[AndrewUnmuted]

It is true that this has entered marijuana folklore. Some people say that the strain type makes no difference to them, and others say that it definitely does.

I'd call them guidelines rather than scientifically-verified law. Just like other psychoactive substances, results can vary wildly among individuals. My anecdotal experiences do largely line up with the folklore, for whatever it's worth. It goes beyond cannabis, too. For me, drinking gin can be very dangerous because for some reason I get hammered after one or two drinks, whereas drinking scotch of the same proof does not affect me nearly as much.