Yes, that's correct Mark. That's also why it leads to difficulty peeing. Interestingly, the CBD oil has little impact on the dehydration but the THC-only oil (i.e. no CDB, but likely other cannabinoids) has incredible dehydration impact whether it's taken at night or during the day without sleeping... good ol' cotton mouth!

MM,

You missed that the THC does not cause dehydration. It causes the salivary glands to not produce saliva. A properly hydrated body can still have dry mouth/cotton mouth if there is no saliva production.