2C-E, mucous membranes on the other end - I prefer insufflation. To me at least the burn is way overstated - bump it, don't rail it, and it's not that bad.
But I should do an oral dose for comparison sometime...
Insufflation sounds like it is maybe intermediate to oral and rectal. Threshold starts around maybe 10-15 minutes, real manifestations well underway at 30 minutes then after that I usually ignore time for the next four or so hours after which I find myself increasingly losing some of the shimmer of the peak and wishing the stuff would just go away within the next half hour sweetly and quietly like DET does.
My weight is around 195lb/88 kg, definitely soft in the middle, but at 6'1"/185cm I am closer to out of shape than obese...Never been really sure how much of a factor body weight is in psychedelic dosing, feel certain it is not a factor for LSD but for RCs I feel it is at least worth reporting...
I find 8-12 mg by insufflation is about as much as I ever want. Any more and the physical effects become too uncomfortable for me personally. As far as nausea goes, with all psychedelics I always try to eat a good balanced meal at least 5-6 hours or more ahead so the batteries are replenished but the stomach is reasonably clear. I also try to put myself in a position during come ups where puking is convenient and if not a private, at least not a disruptive activity, LOL.
So far with 2C-E I've felt some definite nausea every time, and while I am receptive to it, so far it has not been strong enough to actually happen. Usually what happens is I sit on the tub beside the toilet , waiting for my body to decide which direction it needs to go, and so far every time I have eventually discovered that my fascination with the wall paper is losing it's novelty, and sittng on the tub is not all that comfortable, maybe it;s time to move to another activity or at least a more comfortable chair.
I am, always, a firm believer that if your body really wants to puke, by all means, it should.
As far as phens go it is probably my favorite. The 2C-Xs sort of lack depth, DOXs, just not worth the endurance. My exploratory days were long ago, I just like to still tap in on the rare occasion.
Definitely not a toy. Start low and go slow ...