Which of the following is a short-term effect of tobacco use?

• A. Brain chemistry changes
• B. Chronic bronchitis
• C. Emphysema
• D. Lung cancer

Answer: (A)

Nicotine acts on the brain within seconds, altering neurotransmitter release and triggering a surge of dopamine in the reward pathways. This immediate chemical shift changes brain activity and mood, creating the quick, short-term effects that reinforce tobacco use. Over time, repeated exposure builds lasting changes in brain circuits and dependence, but the first, most direct short-term impact is this rapid change in brain chemistry.

The other health effects—chronic bronchitis, emphysema, and lung cancer—develop after prolonged exposure. They reflect long-term damage to the lungs and tissues from years of smoking, not an immediate result of a single use.