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There is also the HEPA (High-Efficiency Particulate Air) standard for air filters

Between 1968 and 1980, the US National Cancer Institute invested more than $US50m into research on less hazardous cigarettes

However, the FDA is ill-equipped to regulate a deadly product and has limited ability to do anything that would actually make a dent in cigarette consumption

Primary Interviews and Surveys Primary work focused on validating what the desk data cannot fully explain, especially the farm gate pricing basis and the real adoption of inputs that affect yields

[DOI] [PMC free article] [PubMed] [Google Scholar] 35.Hessel P.A., Gamble J.F., McDonald J.C