Well, in my experience so far, it seems like the more I vape, the more pleasant the onset is. If I vapo barly enough for a breakthrough, the separation process from body and mind, or ego loss, or questioning of my very own existence or whatever it is, seams to be rather long, pre-dominat and just simply weird... If I smoke enough, this process is so fast, I get blown strait to hyperspace without questioning who or what I am.
Also the second round of the day, when I must have some residual DMT in my body seems far smoother and pleasant ... Also, the preflight anxiety is far less the second round, which definitely helps with the whole experience
