I don't think I've ever seen juice "advised" not to use in certain devices, but it is either way too high in nicotine (possibly) and would make you nic sick inhaling that much of it, or perhaps too high in PG, although it would have to be fairly high PG to not be usable at all, in a sub0hm tank, I mean, you may get better results or clouds with high VG, but unless it's less than 50% VG, I'd think you could vape it.
What is the nicotine strength and where did it come from? I DIY "MTL" nicotine at 18 m.g., but started out vaping 12 mg/ml juice in a very sub0hm tank when I started vaping this time around. It was way too high, and I did get nic sick.
IMO if you are "really" subohming, like something like 0.2 resistance at say 80 watts, anything over 6 is just asking to get nicotine overload.
Anna