When consumable part such as pressure-resistant cover is installed on a chemical solution injector, consumption degree data is read from storage means such as an RFID chip of the consumable part and temporarily held. A cover skin is deformable in one direction without exhibiting substantial deformation in a transverse direction. Such methods are useful in achieving target blood nicotine concentrations for smoking cessation and therapy. The quartz substrate can then be used to drive other electrical elements with a frequency equal to its resonant frequency.