Smoking Crossword Puzzle

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Across
  1. 4. Good friends try to ____ their friends from smoking
  2. 7. The highly-addictive substance in cigarette
  3. 8. __________ cigarettes are battery-operated
  4. 11. A side effect after stopping smoking for some time
Down
  1. 1. The ___________ system is affected the most from smoking
  2. 2. People smoke because they want to look ____
  3. 3. The Central _________ Bureau (CNB) is the drug enforcement agency in Singapore
  4. 5. _______ smoking is also known as second-hand smoke
  5. 6. Carbon ________ is a poisonous gas that decreases oxygen levels in the blood
  6. 9. Smoking causes the _____ to get darker in colour
  7. 10. The sticky substance in cigarette that is also used to construct roads