Arif has recently quit smoking. What benefit can he expect to occur within a few hours of quitting? O blood oxygen levels returned to normal
O risk of heart disease cut in half
O improved liver health
O reduced coughing and congestion

The first one will happen very quickly

Blood oxygen levels returned to normal

Explanation: Since we are always breathing in oxygen, stopping the use of cigarettes can instantly improve what air you’re breathing in. This alas can raise your blood oxygen levels in a positive way:)

Hope this helps!!

It depends on the numbers, of people who were in the area. for you can not determine those who suffered minor injuries, without more information.