Welcome to PsychonautWiki.
Please note that we must not do qualitative comments in any case without a substantial amount of scientific citations. Wikipedia does not cover scientific citation. "there is a common misconception that Black Tar Heroin is less pure or potent than its powdered cousin" is completely unacceptable.
If you feel that your addition is nevertheless valid, please add section by section and cite real publications. (You can use Mendeley and ResearchGate platforms for this).
-- Kenan
