Answer:
The risk factor is that he is going to keep going, not focus on his work, and have health problems.
Explanation:
Mike is going to need to go to an addiction center to remove his addiction. Since he used the drug, lots of damage is already done to his lungs. His health is not going to recover unless he quits. If he continues to do it, he will eventually die a earlier death. The risk factor is his health deterioration.
Count sheep, count down or count up... or just clear your mind whilst looking at a single spot on your ceiling.
a combination of specific etiologic factors is the answer.
