I had read somewhere that the hcl could be irritating to your lungs. good to know.
The idea of possible irritations when using salts for vaporization is like follows:
Normally molecules in their salt forms have a highly increased melting and vaporization temp. Sometimes they wont even vaporize anymore and degrade directly into other stuff.
This is of course very unpractical. Still it was found by some users that you may indeed vaporize DMT Acetate. The vapor was reported to be more harsh and not so pleasant.
Therefore it comes in mind that the salt may be taken up, but form acetic acid again, which would be irritating when inhaled. And inhaling any other acid, masked behind a salt, would therefore possibly also act as you would have inhaled the original acid.
I highly doubt that when heating a Alkaloid*HCl it forms airborne HCl which you may inhale, but still you should focus on using freebase molecules for vaping.
If you are unsure and would like to revert:
Place your Changa in water - this will only dissolve the Harmalas. Just let it sit, dont move it, this would maybe also detach some DMT from the herbs.
Then get them out, dry em and apply a base to your water. Then the Harmalas crash out and you can collect them. Dont forget to wash them until they are free of any base (like NaOH that you used to freebase them). A possible way is to either use Ammonia (which will not leave back anything as NH4OH will dissociate into NH3 and H2O, unlike NaOH) or you could use 1 big container, let the freebase Harmalas settle to the ground, decant as many water as possible and then add new water and repeat. Do this until the pH is around 7-8, then the Harmala freebase is free of any NaOH and you can decant and dry them.