Edit to above:
I meant no conclusive evidence of harm, conclusions of studies are obviously keen to stress that long-term harm cannot be excluded, out of caution, but that they are many orders of magnitude safer than smoking.
Given that there are some 80,000 smoking-related deaths per year in the UK, a move to subject vaping to the same restrictions as smoking would be criminal . Those are lives to be potentially saved if every smoker switched to vaping.