Welcome to the Nexus!
It sure is amazing, isnt it? And it will not stop being amazing! Sometimes the trips seem to have common/repeating themes, but sure enough it will completely blow your expectations again,and again, and again. I first smoked dmt quite a few years ago and I see no end to this rabbit hole
Regarding how often is too often, only you can tell that. Did you read our health and safety section in the wiki? I think the important thing is that your responsibilities in life are still being fulfilled, and that you take care of integration. Its natural that in the beginning there is the so-called 'honeymoon period', where there is a more regular use, but soon enough it fades out and becomes a less frequent thing. I would bet if we made a questionnaire for people of how often they smoke DMT and how long ago they started using it, there would be a strong negative correlation.
But this also goes in phases, so sometimes there may be a day where one smokes a few times, or a weekend with a few launches too, and then spending long time without it, etc. So just try to be reasonable with your use, listen to your good sense and your body, and you'll be fine. I think the fact that you are asking yourself these questions and wanting to make it responsible is already a great attitude that will be on your side
Are you interested at all in taking dmt orally too? What about other psychedelics, whats your experience with that (you said you are not new to them but im wondering if you could expand a bit more).
In any case, glad to have you around, and certainly medical knowledge can be a good contribution to the community! See you around!