It is the most common exogenous cause of human cancers, being
responsible for 90% of lung cancers.

    The main culprit is cigarette smoking, but smokeless tobacco (snuff,
chewing tobacco, etc) is also harmful to health & an important cause
of oral

Examining how healthy a particular posture (or activity) is for the human body can be determined by examining the forces that are exerted on the body during the posture, and then determining if these forces place excessive physical stress on the structures involved; excessive stress can, in time, cause injury. The term “posture” literally means “position,”