It wasn't easy for me. Tried e-cigs first, Blu, then later NJOY rechargables (4.5% nic, Bold flavor, also Gold at I think 2.4%) from online, then tried Vuze (4.8% nic) egics, and a lot of liquids from VaporFi, using all of those, I quit 8 months ago, lol.
What made it permanent though, is finding naturally extracted tobaccos (NETs), and I now vape those at 18 mg to 24 mg nic, depending on the device (CE5+ clearomizer, 24 mg, Nautilus Mini, 16 to 18 mg nic). Higher PG/VG ratio gives a harder throat hit as well, so I go 70/30 to 50/50 PG/VG. And I still keep an NJOY and/or a Vuze around for a quick hard hit if needed when I don't have time to really vape.