I gave my first
vape kit (Green Smoke) to a friend who smoked ultra lights (2 PAD). The Green Smokes were 12 mg and made her sick. She re-ordered cartridges in 6 mg and is happy as a clam. So I think if I were starting from ultra lights, I would
buy a small bottle of 18, 12, and 6 and see what worked best. You want enough nicotine to stop the cravings, but getting too much isn't fun either. I am down to 6 mg from 12 now and I didn't really notice it at all when I changed. I still have a lot of 12 mg, so will probably start cutting it with some zero nic to bring it down to 6.