Nonvolatile and polar drugs are excreted mainly by renal excretion. Volatile drugs, such as gaseous anesthetics, alcohol or drugs with high volatility, are excreted via the lungs into expired air. Which of the following statements is correct?
1) Only the 1st statement is correct
2) Only the 2nd statement is correct
3) Both statements are incorrect
4) Both statements are correct
5) Cannot determine the validity