Re: This is easy to check...
Maybe not as much as you might think.
Remember, The American Tobacco Institute for years did not lie that they passed certain tests with regard to tar levels in cigarettes. The lie was that the bits that caused differentiation in the tests would also cause differentiation when used by actual smokers. The reduced tar levels were primarily attributable to little holes in the paper on the filter which functioned properly in tests, but which smokers cover with their lips when smoking.