Using a gas like carbon dioxide to reduce friction on a flat surface will always result in smoother motion without any limitations.

Using a gas like carbon dioxide can lower friction by creating a thin lubricating film, but it only works when the gas stays in a stable, pressurized layer. The film’s thickness and stability depend on the gas pressure, temperature, and the roughness of the surfaces involved. If the pressure is too low or the temperature too high, the gas film collapses and friction can actually rise. At very high temperatures the CO₂ may vaporize or escape, thinning the film and increasing drag. For instance, on a steel plate at moderate temperatures a CO₂ film can smooth motion, but at higher temperatures the film breaks down and the surface becomes rougher again.