250 Thin puff of white smoke under hard acceleration

I mentioned this in another thread when I suspected my cat was failing but I just want to make sure this is nothing to worry about.

I can't confirm if it does it every time as I can't see the back of my car but my friend was following me and said when I out my foot down hard, was in third I think, a very thin ouff of white smoke came out. No other puff of smoke at all, apart from condensation in the mornings.

 

No loss of any fluids

 

I am paranoid yeah!
Especially after my last one!
I just would rather prevent than fix so any advice would be great, of its nothing then cool I'd just like to know.