I am an MPH student at Yale. I am working in a part time job, and so are many of my peers. What I highly recommend doing is reaching out to professors and faculty about paid part time jobs in the field. I work in a position that relates to what I want to do when I graduate with my MPH. I justify the added stress and lack of time by knowing I am 1) making money and 2) setting myself to be more competitive for jobs in my field after graduation. I will say I am definitely more stressed and more tired than my friends who are not working who seem to have lots of free time, but it is definitely manageable if your employer is flexible and you have good time management. I would not necessarily recommend taking time away from your studies for a job out of the field, but if you can find a job related to public health, then a little less time spent on studying and school work may be worth the work experience. If you think your current job would be beneficial, then,, in my opinion, it is not impossible to manage.