If I recal, High Voltage" for nHaler is juice made for higher voltage e-cigs. The nic is about 10 to 12 mg. Yes, you could cut it without a problem (though the flavor will diminish a bit depending on how much. Not sure VG would help since it is already pretty think - you may need to go with PG, PGA, or distilled water. Hopeful that someone younger and with more braincells can confirm this, but I am pretty sure it is correct
Welcome and good luck.