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Discussion In this large nationally representative study of childhood smoking and COPD risk, age of onset for cigarette smoking before 15 years of age was significantly associated with COPD risk, independent of cigarette pack years, current smoking status, secondhand smoke exposure, and smoking duration

The earliest traces of human occupation at Caracol date to roughly 1200 BCE deep in the Middle Preclassic period, when the Maya were only just beginning to build permanent villages of wattle-and-daub houses across the lowlands (Chase & Chase, Estudios de Cultura Maya , 1989)

Nonsmokers exposed to secondhand smoke are more likely to develop heart disease, lung cancer, and other respiratory problems

Nash helped her mother run the organization and was a spokesperson for MAVIS for years