Regular tobacco use can lead to which of the following health issues?

Regular tobacco use is directly linked to several serious health issues, including heart disease and chronic obstructive pulmonary disease (COPD). Tobacco smoke contains harmful chemicals that can damage the cardiovascular system, leading to the narrowing of blood vessels, increased heart rate, and elevated blood pressure. This contributes to the development of heart disease, which can manifest as conditions like coronary artery disease or heart attacks.

Additionally, tobacco smoking is a leading cause of COPD, which encompasses chronic bronchitis and emphysema. These conditions impair lung function, making it difficult to breathe and leading to a significant decline in overall health. The detrimental effects of tobacco extend to various body systems, significantly increasing risks for a range of diseases while impairing physical fitness levels.

In contrast, the other options suggest benefits or improvements that are not supported by scientific evidence. Tobacco use does not lead to an increase in muscle mass, improvement in bone density, or enhanced cardiovascular health. Instead, it is known to have the opposite effect, undermining fitness and overall health, making the choice correctly aligned with established health knowledge.