you actually can get very noticable effects from even mild reversible MAOIs such as harmine, and harmaline , and tetrohydroharmaline...
In fact, often, shamen in the amazon will brew ayahuasca without a DMT containing admixture, simply for the effects of the caapi, which I would like to think are based on more than just spiritual beliefs , and also observable via science, but I dont know.
Usually the caapi only brews are A HUGE DOSE of harmalas, like 200 grams of caapi instead of 40grams or something ridiculous like that.
I dont know the content difference between SR and caapi though....
I doubt smoking even a few grams of the stuff will do much though
at least not as much as if you just eat it (brew it and drink it)
Dont be expecting very psychedelic effects like visuals etc...
For me, caapi on its own just sort of gives me a positive, relaxing energy. I am comfortable , but kinda on edgy if I dose too much it can get uncomfortable.
I smoke caapi leaves and usually have to smoke a few joints or bowls worth to get any noticeable effect, and its hard to judge because its not an instant effect, rather it subtly begins to happen, then eventually you realize you feel A LOT different then before.
Now that I think of it, harmalas seem to be very active at tiny doses (as far as combining with tryptamines goes) and easily smokable in a plant leaf with no extract, its very possible that smoking the seeds could be efficient enough.......
Do and do tell.