I haven't done those studies myself, no.
What has happened in Australia is that the market share of cheap cigarettes—what we call “cheapies”—has quite dramatically surged. The data that I have shows that the share of the market for cheapies increased 135%. Smokers are now going into a store and saying, “Give me your cheapest cigarette”. That's what they're buying.
The medical evidence shows that smokers can't really tell the difference between one brand of cigarettes and another brand. When I tell that to smokers, they deny it vehemently. They say they can, but it seems there's no real evidence for that.
People are substituting legal cigarettes for illegal cigarettes and expensive cigarettes for cheaper cigarettes. That's probably a combination of the removal of branding and, of course, the increase in the size of the illegal market.