When OP first posted, I spent some time searching variants of "CDC survey OR CDC study," "tobacco," "e-cigarettes," "youth," and "gift card." Never did find the current study, but interestingly I did find any number of references where researchers and survey takers (CDC among them) would offer gift cards as an incentive for people to participate.
I did the same with the same results...
In light of this, I have to wonder at the accuracy of any of these studies/surveys, where the incentive to respond is monetary (i.e. selection is not random, which as I understand statistics is the only way results could be extrapolated to a population level).
Probably about the same effect as campaign election workers giving out pints and a rides to the voting booth.
A decade or so back we had a similar thing going on with registration signatures in Ohio:
Police & Fire - Toledo Blade
Followup: The Ms. Pitts died from an apparent overdose on the day of indictment of Staton:
Defiance man indicted for voter-signup fraud - Toledo Blade
I did the same with the same results...
In light of this, I have to wonder at the accuracy of any of these studies/surveys, where the incentive to respond is monetary (i.e. selection is not random, which as I understand statistics is the only way results could be extrapolated to a population level).
Probably about the same effect as campaign election workers giving out pints and a rides to the voting booth.
A decade or so back we had a similar thing going on with registration signatures in Ohio:
Police & Fire - Toledo Blade
Followup: The Ms. Pitts died from an apparent overdose on the day of indictment of Staton:
Defiance man indicted for voter-signup fraud - Toledo Blade
