Source: Journal of Geophysical Research: Atmospheres
Acts of war have ignited city-wide fires whose smoke rose high up into the atmosphere. If this smoke rises above the weather layer, the smoke is stuck at high altitudes for months to years and spreads out across the globe. While aloft, smoke shades the surface of the Earth. A concern is that global food production could be jeopardized by severe cooling due to high-altitude smoke.
To understand how much surface smoke actually reaches high altitudes, Tarshish and Romps  use analytic plume calculations and direct numerical and large-eddy simulations to show that condensing water vapor plays an essential role in powering the ascent of smoke plumes to ascend to climate-altering heights.
Citation: Tarshish, N., & Romps, D. M. (2022). Latent heating is required for firestorm plumes to reach the stratosphere. Journal of Geophysical Research: Atmospheres, 127, e2022JD036667. https://doi.org/10.1029/2022JD036667
—Minghua Zhang, Editor in Chief, Journal of Geophysical Research: Atmospheres