Which of the effects are caused by breathing in both carbon monoxide and nicotine from cigarette smoke?
1) increased heart rate
2) increased risk of cardiovascular disease
3) increased risk of emphysema
4) increased risk of lung cancer
1 )
1, 2 and 3
2 )
2, 3 and 4
1 and 2 only
4 )
3 and 4 only
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