I have not smoked DMT for around four years, during the period when I last smoked I had a good deal DMT, most of which I ended up giving away.
my first experiance was beyond intense, and as a result it took me several months before I had the courage to try again. When I did begin to explore again I experimented with micro-doses and low doses just to gain a feel for the full range of possible effects the compound is capable of producing, I eventually worked my way up until I reached a 2nd experiance which was again, beyond intense, at this point I stoped my exploration.
I only smoked a total of maybe 16 times, though I wasn't keeping an exact count, the majority of these ventures were micro-dose or extremely low dose, and were in an attempt to gain a feel for the compound and it's potentials, as far as experiences where I thought the full spectrum of potential affects were encountered, I only had 3 of these, 2 of which were in the "beyond intense" catagory.
I began experimenting with yagé and yagé analogues shortly after I first encountered DMT (well, I don't know about shortly, as my first experiance with DMT prevented me from wanting to try it again for several months, but a while after my first encounter) I've found yagé or ayahuasca which ever you choose to call it to be much more gentle,( aside from the physical distress and purging ) it seemed to slowly bring you up into the DMT experience, where it then holds you for a time, before proceeding to gently guide you back to baseline, I guess saying "it's fairly smooth transitioning through the experiance" would better describe what I'm trying to say.
I still will only use yagé on fairly rare occasions, once every few months is heavy use in my eyes. It's hard to designate an exact time frame, but after a good deal of time has passed you begin to forget, you forget exactly how the psychedelic experiance felt, you begin to forget some of the lessons you had learned, it's as if you need to be "'re-freshed" in psychedelia.
I generally obtain a long lasting sense of stability and understanding after a good psychedelic venture, I obtain a renewed outlook on existance which generally results in a lasting positive mindstate, the psychedelic experiance tends to re-organize my psychology, and I am able to abandon a good deal of the negative psychological processes I may have fallen into.
Any way without going into depth on any of this, I can still say that even my yagé use is quite rare, and often only occurs if I feel it would benefit me psychologically or spiritually.
For as much as I research entheogens, and discuss entheogens, it's actually fairly rare that I will actually use them.
I don't smoke DMT anymore, this is not to say that I won't ever smoke again, it's just saying I have no plans or direct intention to smoke DMT anytime soon.
As for yagé and yagé analogues, once every several months is considered heavy use for me.
As for mescaline, LSD, psilocybe fungi, RCs, and so on, I can't say I ever consistently use these compounds, they are more like a rare and novel treat that weave into my life from time to time. It's generally never a planed thing, its just when the time is right and the compound is there it just seems to happen, but I can assure you it doesn't happen all that often.
There was a phase when I was younger where I probably over-used many psychedelic substances, and at least for me it seems that when you begin to take them more often than you should, the benefit you gain from them can definantly decrease, it's as if the compounds want to say "ok buddy give it a break, and if you don't I'll stop providing you with beneficial experiences"
This is just my take on it though.
This is an interesting topic though, and I've always been curious as to the frequency of use regarding these compounds.
I've always agreed with mckenna when he said "when you do these things right you do not need to do them often" however I also agree with the Buddha when he said "1000 people, 1000 paths", understanding that everybody is unique and that everybody is going to have their own path.
-eg