When I see the clouds of vapour that comes out of people's mouth when they subohm it scares me a bit. And so does the whole lung hit thing. Basically the lungs are meant to breathe air, anything else being inhaled over time can't be a good thing in my mind. I feel lucky that a standard clearo/ego set up is satisfying for me, although I did dual use for a while in the beginning. But I don't think dual using is a problem if someone has it in mind to eventually lose the smoke. It happened quite naturally for me and I wasn't initially intent on stopping smoking. Only after I started vaping did I realise it was a possibility. I reckon it's more important to dilute the flavour strength over time than it is to reduce the nicotine. Nicotine in my mind is a sort of preventative medicine. It manages mild depression and anxiety, improves concentration, and can potentially prevent dementia and Parkinsons in some people. So I've decided to stick with the nicotine and go easy on the flavours and vapour volume. I'd hesitate to recommend subohm devices to a new vaper, except in instances where the person is really struggling to switch.