Which of the following substances in tobacco smoke damage the gas exchange system?
A. carbon monoxide and carcinogens
B. carbon monoxide and nicotine
C. carcinogens and tar
D. nicotine and tar
Answer:D
Which of the following substances in tobacco smoke damage the gas exchange system?
A. carbon monoxide and carcinogens B. carbon monoxide and nicotine C. carcinogens and tar D. nicotine and tar