I wouldn't completely set them aside. I think one area that I would disagree with my colleague on here is that the risks of electronic cigarettes are unknown and will vary from product to product. Poor quality products burn or heat the nicotine less effectively and less thoroughly and produce more toxins than others, but with a good quality product the level of risk, although unknown, is in an order or two orders of magnitude lower than that of inhaling cigarette smoke. So whilst there is a risk there, that risk is trivial in comparison to the risk of continued smoking. The challenge is to try to minimize that risk as much as possible. As has been argued, it will be decades before we know what the impact of that is. But to minimize that risk by making the emissions as clean as is reasonable....
I think the risk is very low. So it's not that we can ignore it but I think we just have to keep it in perspective.