I believe you may be able to smoke the freebase? More potent, shorter duration? Maybe not much shorter duration... The HCL is IV-able perhaps and def insufflatable and active orally and under tongue mouth absorption, I think this is a general psychoactive chemical ROA property. Snorting the salt brings a much quicker onset with not much difference in duration, slightly shorter.
Freebase is smokeable and has a lower molecular mass so you will be getting more actual 4-AcO-DMT per gram as compared to the fumarate salt. The salt can be snorted, injected and is slightly more stable (does not break down as easily as the freebase).
I've read that it can break down into 4-HO-DMT (psilocin) therefore most vendors turn the product into a more stable salt so as to cover their asses from the law. I have no idea how fast it would degrade - but I imagine that you could hold onto it for a while in a vial stored in a cool place with some dessicant.
i've had 4-aco-dmt fumarate sitting around for probably 8 months in a plastic bag, away from heat/moisture and it didn't seem to loose any potency
I have the opportunity to get 4-aco-dmt in fumarate or in freebase. The prices are very similar. The freebase form is more potent, but has a shorter shelf-life, correct? I am not too concerned with the shelf-life. I have a nice, cold, dry freezer. But, is the trip duration shorter with the freebase form?
I would guess that it's not shorter, since snorting it doesn't make it that much shorter. Especially because no matter the ROA, it still has to be de-acetylated by your liver before it's psilocin.