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The researchers investigated the impact of SHS on the formation of cells labeled with p21, an early biological marker of senescence that is enhanced in bronchial cells after exposure to cigarette smoke

Kevin Everett, PhD, is associate professor, department of family and community medicine, University of Missouri, Columbia

The cigar consumption amounts to about 10 cigars a day for the past 42 years

Dimensions: 3084 x 4298 px | 26.1 x 36.4 cm | 10.3 x 14.3 inches | 300dpi Date taken: 3 January 2011 Photographer: BJ Warnick More information: This image could have imperfections as its either historical or reportage.

Stroke Risk When consumed excessively, tobacco can damage the blood vessels that supply oxygen to the brain

Blending cannabis with tobacco wont directly amplify THCs psychotropic effects, though it can alter how they present