Background info: Unfortunately, I have a naturally high tolerance to DMT - I don't think I have ever broken through on less than 80 mg with any route of administration (sandwich, enhanced leaf, machine). I am experienced, with 100+ breakthroughs under my belt. My preferred technique is 1.5:1 (DMT:mullein) enhanced leaf in a bong. My typical dose to break through consistently is 140mg of the leaf mixture, or 84mg DMT. Disclaimer: don't try such a high dose unless you determine you need it by working up from lower amounts.

The last few days I have had some unusual occurrences. Yesterday I smoked that amount twice - both times the smoke was unreasonably harsh, which I latter determined was caused by some big mullein stems that were accidentally in the blend. The first time I had a few open-eye visuals, but nothing significant really. For the average user, I would say this was equivalent to ~20mg. The second time I had to abort because it was too harsh. I figured that the minimal effects for this dosage were due to the heavy stems throwing off the ratio of DMT in the blend.

Today I tried again twice with the same dose. Both times I had almost no effects at all - just barely above threshold. There was slight color saturation and my pupils were dilated, causing light halos, but nothing else really. I was able to get up and walk around almost immediately after dosing. I find it really strange and disappointing that I am getting the equivalent of ~10-15mg of effects from a dose that would obliterate most people. I'm also sure that the amount DMT is what I think it is, I smoked some of this same batch last week with normal effects. If it was just one time, I could chalk it up to random chance, but this happened on 3 separate occasions within 2 days.

The only thing that I can think of that has changed in the last week is that I have not smoked cannabis in the last 4 days. I am usually a heavy cannabis smoker (all day), but I usually smoke DMT when I am not high.

Has anyone else had a similar experience or tolerance? I guess I will just wait a week or so and try again.

That doesn't sound right to me... It sounds like you've been at this a while, and typically you would need less and less to get the desired effect as you learn and grow older.

I'm a guy who smokes large doses myself, but I can get really intense effects from incredibly small doses when used properly. If I was experiencing a similar issue during a period or heavier use such as the one you described, I would look at two things first:

I would first consider my overall health and whether I had the energy to be participating in such adventurous activities. Our bodies and nervous systems have to be functioning well in order to sustain the level or energy required to generate a psychedelic experience... and it can be easy to let health suffer when constantly in the face of such captivating mysteries. If I'm in need of rest and recovery before a challenging experience such as a psychedelic one, I personally find that it's always best to prepare my mind and body thoroughly before taking the next step.

If I found that, in my health and state, I'm capable of participating in such an encounter... Then I would consider whether or not I should be using the substance in the first place. I find that the really valuable experiences will come when they are needed. If it seems that the DMT state is not where I need to be looking at that time, then I look elsewhere. The most profound moments and the most beautiful vistas on the journey are usually to be found where we least expect them, and when we need them most. Perhaps what you need in the DMT realms right now is something you can only find here on the ground with the rest of us.

I hope some shines across the path soon comrade, and I hope the way from there is good to you. Happy Trails.

Thanks for the positive vibes, I realize it's best to put down the pipe for a while when things aren't working out. It's actually been a while since I've done DMT (aside from last week) because I've been very busy working on research paper deadline which is finally past. I was hoping to unwind a bit I guess. Better luck next time..

I really don't know that to say, the effects that you describe is what I get from < 5mg.

Maybe you could try straight DMT (no enhanced leaf) using a dry bong.

Im just sitting here trying to fathom what 84mg must be like. Sheeiiit I cant even imagine 40 lol

The ultimate experiment for you is to take a known dose intravenously and compare to your smoked experiences. Then you know if it is your brain or your lungs that is the limiting step.

Yeah, I'd like to try that someday, but it's obviously a lot more risky.

I have had similar experiences recently. I have had previously taken around 50-100 dosages in the past 1-2 years, some with harmalas, some without. In the last 2 months, my effects have been hugely diminished/physchoactively void.
I am now taking a big break, but it`s worrying.
I had been taking ketamine relatively frequently, which I perhaps attribute to the reduction, but obviously finding someone with a commonality in this respect is difficult.
These days, I perfectly vape 50mg, and it does the same as ~10mg used to.
Previously I used to breakthrough on 30mg.