Can only alcohol affect your ability to drive a vehicle safely?

• Yes, only alcohol affects your ability to drive a vehicle safely
• No, illegal, prescription and even non-prescription drugs can affect your ability to drive a vehicle safely
  Explanation:

  "This includes illegal and prescription drugs. It even includes non-prescription drugs such as cold tablets or allergy pills."
• Alcohol only with non-prescription drugs can affect your ability to drive a vehicle safely
• Allergy pills and cold tablets are the only ones which affect your ability to drive safely