Smoking leads to which of the following changes in the blood?
- A$O_2$ levels increase and $CO_2$ in $Hb$ decreases
- B$O_2$ levels decrease and $O_2$ in $Hb$ increases
- C$CO$ levels increase and $O_2$ in $Hb$ decreases
- D$CO_2$ levels decrease and $CO_2$ in $Hb$ decreases
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