We develop an approach to understanding intrinsic mechanisms that cause the T_{1}-decay rate of a multilevel superconducting qubit to depend on the photonic population of a coupled. detuned cavity. Our method yields simple analytic expressions for both the coherently driven or thermally excited cases. which are in good agreement with full master equation numerics. https://allfixelectricales.shop/product-category/audio-turntable-stylus/