What the heck was he talkin bout?

Hello all. I Had a friend tell me along time ago, while looking at some plants I had going. that my crop looked pretty, but I had too much humidity and probably wouldn't be worth nothin. No thc. Course that made me paranoid ever sense.
I've researched on the web, and only one obscure site I found, giving most of the same hash of how to grow and properties of hemp that you get everywhere on the web, But it did say in a passage that with more reletive humidity the plants cant breath good and the leaves get wider for more surface area and don't produce resin. In dry climates apparently cannabasis has thinner leafs for they breath more easily, but also resin is produce to keep leave from drying out.
Now, I'll just say. This is an albotross been hanging over my neck for alot of years and seems to be a fundemental no no that everyone should know about, for it can ruin a whole crops potency, but I've just always heared mixed reviews about humidity and no big deal on its effect. But I've seen it ruin too many of my crops to not know.
Any help or discussion on the subject or related subjects would be appreciated.
Thanks for listening.