I think a lot of individual factors affect a person's ethical behavior at work, such as knowledge, values, personal goals, morals and personality. The more information that you have about a subject, the better chance you will make an informed, ethical decision.
This is a hard question because it really all depends on the person. I would say you are more apt to abuse it orally than smoked, or its high either way.
It could be B or D
Washing your hand before every procedure; C
