The invention relates to a heating unit for an inhalation device for the inhalationadministration of an inhalation mixture of air and at least one additive material,having a fuel storage (252) which is filled or can be filled with a thermally combustiblesolid or liquid fuel (258), and with a combustion chamber (256) for the combustionof the fuel (258), which is essentially sealed from the surroundings by a combustionchamber wall (222). The invention further relates to an inhalation device (210)with such a heating unit. According to the invention, the combustion chamber(256) is designed for forming a flame, and the combustion chamber wall (222) hasat least some micro openings (224). The micro openings are designed in such a waythat the sum of the outer side lengths of all micro openings (224) is at least 140mm,and the sum of the outer side lengths of the micro openings (224) per surface inthe area of the combustion chamber wall (222) averages at least 88mm/cm
