@Jackmax95 and @don_pepperoni, thank you for your feedback.
The smoke is applied directly to the exhaust pipes. I use an original feature from the game map. I tried to implement it, but I can't cut the smoke when the engine is off, and I can't change the smoke volume according to the acceleration or gear changes of the trucks.
The mod presented is the best I can do.

@Jackmax95, the mod must be placed after my other mods “Smoke in my Trucks” and “Traffic Trucks Smoke” to change the default smoke volume that comes with them.
99% of vehicle mods will not work because they change the exhausts.

Check out Truck World Australia's DEMO to see how it works with smoke. Continuous smoke is cheesy.

Also, in what order should this mod go with other mods?

Why is it so hard to implement realistic smoke physics in this game?

@TW, thank you for your feedback.
The smoke is applied directly to the exhaust pipes. I use an original feature from the game map. I tried to implement the feature you mentioned, but I can't cut the smoke with the engine off, and I can't change the smoke volume according to the trucks' acceleration or gear changes.
The mod presented is the best I can do.
Sorry.

Dose it keep on smoking with the engine turned off?

This add-on needs to be used in conjunction with the "Smoke in my Trucks" mod by Carlitos and given a higher priority 👍