I had dry mouth to start with, and the best remedies I have found are Ricolas, biotene, that and drinking something pretty much non-stop. I don't think I increased my liquid intake much when I started vaping, because I'm not sure how POSSIBLE that was, but good old Chamomile tea with honey and lemon really soothed my throat to start.
I do think the humectants in tobacco that make it sliiiide down your throat or whatever it is they do actually made chain-smoking easier than chain-vaping, honestly. I'll occasionally get a sore throat if I'm not paying attention to how much I'm vaping, but otherwise it's usually fine.
AND, I just went out on a bunch of errands, and my batteries died halfway through. Rather than stop to change them or EVEN pull out my backup mod, I just drove the rest of the way home, unloaded all the groceries, etc., and only then decided to fix my vape, LOL. Maybe I am actually ready to step down a bit....
Anna