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From my interpretation, it seems that Pope is saying that exposure to PM 2.5 begins to cause damage at very low levels, and increases steeply if you are a smoker, but then begins to level off -- aka the difference in mortality between smoking 20 a day and 40 a day is not much different

In contrast, erect blackberry types stand independently, but planting on a trellis in home gardens minimizes wind damage to the canes

Studies show that smoking causes 7/10 lung cancer cases, and is one of the biggest causes of death and illness in the world

I live in Haslet, Texas, in a single-family neighborhood (quarter-acre lots, fenced yards)

Procollagen I, IL-6 and TIMP-1 detection was carried out with a microplate reader (SpectraMax Plus 384 Microplate Reader, Molecular Devices, San Jos, CA, USA), while MMP-1 detection was performed with a spectrofluorometer (Varioskan Flash, Thermo Electron Corporation, Waltham, MA, USA)