Hi Ian,
I see in the background the coastguard vessel, and what is going up is not smoke but the wake.
Maybe you can try this, go to the FSX Effects folder and look for the ''fx wake coastguard'' effect open this file with notepad and look for the following sections,
[ParticleAttributes. xx] (there are several)
TempK=109.00 (if it look like this then put two slashes in front of the line)
TempRate=0.01 (if it look like this then put two slashes in front of the line)
So you get it like this,
[ParticleAttributes. xx]
//TempK=109.00
//TempRate=0.01
Maybe this will help your problem, I am not sure because I do not know P3D.
Regards,
Jan