I'm not a smoker, but I still don't know that e.cigs are any better than real ones - there has been no in depth research done into them.
Sadly I think that the lack of any regulation is a dangerous thing. In Bolton Town Centre there must be a dozen places selling these. A couple are dedicated e.cig shops, but the rest are just newsagents and pound shops selling the cheapies and I definitely wouldn't trust them to be safe.
Friends have had these leak, break and even explode while charging - I think some regulation would be a good thing. If that means a ban while they test them, so be it.
(Sorry)