@Klo - It's slightly different, but I have flashbacks that are triggered by the smell of meat pies...
*pause* yes, let's get it out of the way, haha, an Australian getting triggered by the smell of meat pies, how dysfunctional can you get!?
The reason that I mention it is that you seem (I may be way off) concerned that because the smells are obscure, they must be distorted, rather than accurate connections to your trauma. I'm really not trying to make light of the situation, because my flashbacks can be really crippling at times, but for me, I wasn't abused by meat pies, I never had meat pies thrown at me or anything, but the smell is still an accurate connection to my trauma because I was often aware of the smell of meat pies from the school canteen nearby when I was being abused.
The link between things that can trigger my flashbacks and the trauma itself can often seem obscure. But now that I understand it better, it makes sense to me. I used to feel incredibly paranoid about the fact that there were so many kids just outside, hanging around the canteen, when I was being abused, worrying they were close enough to hear or see through the blinds, and also thinking how lucky (urgh, yuck) I was to be having special lessons while all the other kids just stuffed their faces with the same old lunch; and I was also quite aware at the time of the sounds and smells associated with that. So, the smell trigger for me sounds obscure, but when I look at what was happening and feeling and aware of at the time, the pieces fall into place.
Are you aware of any link between, say, the smell of gas and your trauma?