cigarette ads 1920s Philadelphia Athlectic's pitcher 1920's Lucky Strike Ad (Original) Cigarette Advertising in the 1930's

And then I think maybe just to combine two other questions and then you can give whatever answer you can

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When smoke particles enter the optical chamber, these particles interfere with the light beam (i.e., the light reflects off of the smoke particles) and then make contact with the electrical photocells

Sarah Jackson, author of the research and a fellow at UCL Alcohol and Tobacco Research Group, according to CNN Health

It completely cleared the smell out I couldnt believe how fresh the air felt afterward