Earlier quoted context omitted.
Well, no it is important. The first review from the University of Stirling is a review of the literature showing that plain packaging helps makes warnings more clear, packs were less appealing, and expose the reality of smoking - all causal factors to reduce smoking rates - especially amongst younger people. The BMJ study, "Introduction effects of the Australian plain packaging policy on adult smokers: a cross-sectio…
they provide some support for some potential links between plain packaging and reduced smoking. But, on their own, they don't provide support the introduction of plain packaging causing a decline in smoking rates. This is because there are 1) other potential effects of plain packaging on smoking (for example: lower prices -> greater consumption) and 2) there is no necessary link between surveyed perceptions of plain…
The surveys do provide plenty of evidence that plain packaging changes smoking behaviour. The price of cigarettes in Australia has risen due to taxation . A packet of cigarettes cost $16 in 2013, in 2014 it is now $20.
Edit: I was needlessly aggressive. Sorry.