Heating units, drug supply units and drug delivery articles capable of rapid heating are disclosed. Heating units (10, 60) comprising a substrate (12, 62) and a solid fuel (20, 80) capable of undergoing an exothermic metal oxidation reaction disposed within the substrate (12, 62) are disclosed. Drug supply units (100) and drug delivery articles (162) wherein a solid fuel (114, 174) is configured to heat a substrate (64, 164) to a temperature sufficient to rapidly thermally vaporize a drug (110, 166) disposed thereon are also disclosed.
