It's not. When you burn the hash, regardless of purity, you are still generation combustion, which, regardless of materials involved, creates several by-products including carcinogenic chemicals (and yes, there ARE carcinogenic substances in ALL combustion reactions involving plant matter, just some have a considerable amount more, such as tobacco).
What do you burn when you bubble your hash? I fail to see the combustion here, water doesn't burn when you boil it, why does hash burn if its pure resin and you heat it at around 380 degrees, thr point where it evaporates

also
saying foreign matter is potentially carcinogenic is like saying i can get cancer from dirt in a cut
yes it is hypothetically possible, but when I say hypothetically understand that this isn't going to happen, but when you understand the mechanism by which you get cancer it doesn't even take much necessarily. You can even get cancer from nothing at all, your cells can make errors when copying themselves which can lead to cancer depending on many factors.

I understand evaporating hash without a vaporizer can be difficult to do at a certain precise temperature, but theoretically you could I guess.
prairieplantsystems Reviewed by prairieplantsystems on . Smoking pure cannabis resin (hash) vs. vaporizing Ok, if vaporizing is simply smoking evaporated cannabis resin, is smoking pure cold water extracted hash the same thing? Assuming the hash is 100% pure (hypothetically since this would be next to impossible but lets assume for the sake of argument) you are evaporating a bloc of pure resin when you smoke it. The same process goes on in your vaporizer when you heat your bud, evaporating the resin found on the plant material no? I just though I would get your opinion on this. Rating: 5