Unit 1 — Chemical Reactions and Their Environmental Impacts

Science — Third Preparatory

3.8 Summary of Lesson 3

Tobacco contains nicotine, carbohydrates and proteins, minerals (some toxic heavy metals) and radioactive elements.
Its combustion gives CO, HCN, NO/NO₂, NH₃, tar, and thousands of other chemicals.
Harm lungs (tar, emphysema, cancer), heart and blood (CO, nicotine), nerves, fertility, immunity, and addiction.
Smoking pollutes air (CO₂), water and soil (butts).
Types traditional and vaping; exposure: active and passive.
Prevention begins with a personal decision and a supportive environment.

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