I'm aware of West.
Thanks to all of you. I guess my concern is that the Wold Health Organization has been very clear that there is currently insufficient evidence. I need to bring that forward.
One of the other concerns the WHO has is that existing evidence shows that e-cigarette aerosol is not merely water vapour, as is often claimed in marketing. While they are less likely to be toxic than conventional cigarettes, WHO is suggesting that e-cigarettes pose a threat to adolescents and to fetuses of pregnant women using these devices.