Not to be argumentative, but the OP was complaining of harshness when he vapes. Nicotine strength and Pg is what is most responsible for harshness and throat hit. 24mg is for 2 pack per day smokers; the OP smokes 1 1/2 ppd.Are you still smoking??
If so, stay at 24mg/ml.
DON'T subohm. Go to a 1.5 or higer ohm clero. You may drop ohms & nico when you Stop smoking for good.
The reasoning is to get the same amount of puffs as an analog & keep the cravings at bay..
IMHO, the OP should drop his nic down to 12mg, 18mg at the most. If he is going to sub-ohm, he should drop it down to 6mg. Pg/Vg ratio should be in the 50/50 range.
If the OP is going to continue to smoke while vaping, he should only smoke half of a cigarette, and save the .... for next craving. The partially smoked .... is going to taste nasty, but that will help him quit. The half of a cig will be enough to get past his craving.
It's not how many cigarettes you smoke which is important, its how many you DIDN'T SMOKE.