"exposure"

i've heard and read the word "exposure" used in reference to treatment of mental illness and addiction. for example, when someone suffers from a phobia, they are brought into contact with the object of their fears.

since beginning this journey, it has come to my attention that some people that work in the treatment of mental health and addictions are actually themselves in treatment. it makes me wonder why they would choose such a challenge for themselves. what could compel them to face their addiction everyday through someone else? i would consider this an exposure.

i'll have to ask.