I know people have talked about trying to vape dmt in vape pens, and it doesn't work very well. What about dissolving a maoi along with dmt in glycerin then use that in the pen? Maybe you could just do a crude extract of passionflower and rootbark with iso, and use that.

Maybe you could try it and tell us?

People have tried harmalas, but even very good exractions of them would clog up the e-cig pretty quickly it sounds. And e-cigs do work well in some regards. Depends on what you are looking for. They are not good for blasting off in one hit, is the main thing.