I've owned cars for 40 years. And not once in 40 years, has the ash from a cigarette caused a seat to immediately burn. And I mean burn. Not just a burn on the outside of the fabric, but deep down into the padded material within seconds. Thankfully, I was able to put it out in the heavy smoke phase, before it turned into a full blown burning flame, burning the entire car seat and car. After my experience, it floored me that wasn't discovered during any type of testing that might be done on a vehicle. A major safety issue in my mind. I decided to report it now, because I'm surprised nobody else has. Considering there aren't a lot of cigarette smokers it's not surprising I guess.