The thc will turn to CBN wich will give u a hash like high, if you like hash you can leave it there but it will be like smoking the outte layer of a bar of hash, that black part, while collecting it at the proper time would be like smoking the inside golden part.
This thc destruction is what forms that darker outter layer in hash bars. But when it does that layer it basically blocks any air from going thru that layer protecting the inside part.