Generation vape: How dangerous are e-cigarettes?

Are e-cigarettes ticking time bombs? Our panel looks at vaping's first major health scare as Donald Trump considers a ban on flavoured brands of e-cigarettes. They are under scrutiny after hundreds of cases of mostly very young users falling seriously ill. But is vaping really dangerous? It's so new that one can only wonder if it's too soon to measure the long-term effects. Do you ban, regulate, restrict? And how - in less than ten years - did it become such big business?