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A second, smaller study looked at how smoking either traditional cigarettes or electronic cigarettes with nicotine impacted the heart's ability to pump blood through the body at rest and during exercise

Cunningham noted that other factors besides images on cigarette packs such as tax increases and restrictions on smoking in certain places likely played roles as well

When smoke particles exceed pre-established thresholds, the sensors will generate an alert

We never seem to weary of it

Reuters spoke with more than 10 e-cigarette and vaping companies - including Reynolds American, which sells Vuse, and Altria Group, which sells MarkTen and Green Smoke that acknowledged they have been contacted by state law enforcers or by the National Associations of Attorneys General