I started on 18mg for the baccy flavours and 12mg for the fruity/minty ones. I've cut down my fave blackberry and spearmint mix to 6mg with no problems (I went cold turkey from rollups to vaping on New Year's Eve), but I still sometimes yearn for a baccy hit, and it needs to be at least 12mg, preferably 18. The yearn comes when the missus is having a fag and I've had a drink or two. I suppose this will fade in time. Not a solitary cig in nearly six months however, after 35 years of smoking. Gotta love it.