The real issue I had with the original article is the 10% figure. That would be considered very low by all I have heard. I believe it has been stated by others who would know better that the amount would be closer to 25% with another 25% that struggle with the issue of WTA. The real number may be closer to 50% overall who would benefit from WTA in some form. For some it would be staying away from cigarettes and for others they may actually be able to cut the chain to there PV for at least a little while.
The need for WTA is significant and a good deal more then is implied.
I have long surmised it at around 50%, though of course there's no cut-off line in this; it's more like a continuum.