I used to smoke the most when I was on the run. Waiting for the bus, going from bus-station to subway, and subway to work, etc. So during that time I use relatively low-nic cartridge for my 801.
Once I get to work or home - I stick my USB pass through for 4081, and strictly drip only with 18mg - just rough counting of 2-3 drips being 1 cig. After 10-15 puffs, I sometimes feel like having little more, so I usually add another couple drops of low-nic of my choice, and I'm good to go for another hour or two.
I also kept my habbit of going outside for vaping (or to my personal vaping room in the back) - and also doing so, along with dripping, I can pace myself. When I was using topped off carts / refills - I was just having too much. I used to finish 1 mini cart in one sitting. Now only dripping, I can consciously control my nic level, which is good thing.