Which body systems are affected by tobacco, alcohol and drugs?

• A. Heart, lungs, circulatory and digestive systems
• B. Skeletal system only
• C. Muscular system only
• D. Nervous system only

Answer: (A)

Tobacco, alcohol, and drugs commonly affect multiple body systems. These substances can influence the heart and the circulatory system by raising heart rate and blood pressure and by contributing to cardiovascular damage. They also impact the lungs, especially tobacco, which irritates airways and lung tissue. The digestive system is affected too, with alcohol taxing the liver, stomach, and other parts of the digestive tract. Because these substances don’t limit themselves to a single system, the option that includes the heart, lungs, circulatory, and digestive systems best reflects their widespread effects. While the nervous system is also affected by drugs, the other choices imply only one system is involved, which doesn’t capture the broader impact.