I had the same trouble. LR stuff was just coming out when I started and to this date, never really cared for it. I tried all the suggestions, upping the nic level and the snus. Snus helped me first thing in the morning but it wasn't a habit I really wanted to pick up. I just backed down on my smokes, still had my three in the morning which is when I really relied on them to keep me sane and a couple in the evening. In between I vaped. I vaped basically where I didn't smoke, not in reverse.
Someone suggested I get a mod. They suggested a chuck. I took their advice. Went to a cartomizer because fillers and atomizers just didn't give me a high success hit every time and I was tired of the cleaning, the burnt filler and all the leaking etc. I stuck with my little 510's while waiting for my order to be made and shipped. Got them, couldn't believe the difference. Still had my morning cigs, but now was down to about three a day instead of ten. I got brave, ordered bats and started vaping at six volts, gave up the cigs completely. Had a few small hurdles to get over that one morning smoke with my coffee but it wasn't nearly as bad and I haven't looked back since.
Had a co-worker who smoked three packs a day. Upon my info, she picked up a 510 kit and quit instantly. She started to really want to go back to smoking. Got to the point where she was going to cave. I let her try my device at six volts, (prior she always said she liked her little 510 and I don't think she liked the look of the big mod) She took a hit, looked at me and said, "I want what you got" I had several of these so I sold her that one on and got her the batts and charger and she's been great ever since and her massive cig craving is almost gone.
A year latter, I still get a desire for one. Even have gone so far as to pick one up. The hit of the cig is nothing compared to the hit off my chuck and I swear that is what has kept me successful.
It isn't a route for everyone but for some reason, this is what worked well for me. I think in part because I never directly inhaled my cigs, rather took that big long draw and then inhaled. I vape the same way, and the higher voltage unit gives me a big giant draw with little effort and enough vapor to get the secondary inhale that will still satisfy my lungs and nic need. And yes, I still vape at 12-18mg...I amped up to 24 this winter and am now working myself back down to the 12-24 range.
Not sure if this helps or not. But it really worked for me and had I not gone the high voltage route, I know deep down that I'd be back on the 'analogs' We all might be addicted to the nic and chemicals from smoking but the habit of smoking is perhaps a bit more individual when it comes to 'missing' something.