Using smokeless tobacco will most greatly increase the risk of

Using smokeless tobacco will most greatly increase the risk of oral cavity cancer (which includes mouth, tongue, cheek, gum cancer). Yes, even though smokeless tobacco help some people to quit smoking, it can still cause cancer such as oral cavity cancer and other health problems. The cancer-causing agents in smokeless tobacco are tobacco-specific nitrosamines (TSNAs).

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the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.