Does the aluminium heating block emit any substances which are subsequently inhaled by the user?
No. the top temperature reached in the heating block 240C (464F) is by far below the temperature that is needed to emit any substances out of the aluminium alloy AlMgSi, melting point 660C (1220F); boiling point 2519C (4566F) used by us. This is documented by an analysis of the air produced by the Volcano on top temperature made by the University of Leiden, Netherlands.