Thank you for the response. I understand what you are saying, but as you feel lower consumption is healthier, I feel quality of consumption needs to be factored in. I am not saying more is better, or even equal. I am saying that by neglecting the quality of the vape as in the toxin’s it may produce can very well sway the results. Vaping 2ml per day at high temperatures can easily be more damaging than vaping 10ml per day at low(er) temperatures. And without knowing the details we cannot generalize! There can also be a point of diminishing returns – 2ml per day at toxic levels vs 60 ml per day at less toxic levels as an example. But again, without knowing the details we are making assumptions. When assessing risk, one cannot work on assumptions - for doing so you may assume risk, not mitigate it
The question asked was, is MTL safer than DTL. Either action has their equivalent risk. How each action is performed by the individual will dictate what is more of a risk vs the other. And the amount of total e-liquid consumed within a duration is only one variable of many.
What is also fact – now that you brought up hamburgers, I am now hungry. (picks up phone, logs into Uber Eats which IS harmful to ones health!!

)