I think it's very like smoking - or rather equivalent in satisfaction and feeling of density of the inhalation.
In terms of taste, much better than fags (certainly if you go down the sweet flavours). It makes fags quite disappointing.
I smoked 17-20 per day and started vaping at 18mg, but dropped to 16mg after a couple of months.
I do still smoke, but only 5 per day and I don't notice how few I now have. I never pressured myself to stop entirely and still smoke when I want, I just don't want many. I will stop in the coming months, as I know it's only a psychological need now.
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