Possible Bakelite
The United States Environmental Protection Agency, or EPA for short, has this to say about the efficacy of HEPA Filters: This type of air filter can theoretically remove at least 99.97% of dust, pollen, mold, bacteria, and any airborne particles with a size of 0.3 microns (m) Particles that are larger or smaller are trapped with even higher efficiency
There have also been major advances in radiation therapy, surgical techniques, screening, and diagnostic imaging as well as advances in cancer genetic research thats helped identify which mutations are driving peoples tumors, so treatments can be tailored to the patient
During that time period, while industry spending on direct advertising fell from accounting for 80% of total industry marketing expenditures for cigarettes in 1975 to less than 3% in 2019, spending on price discounts rose, accounting for 87% of all marketing expenditures for cigarettes in 2019