bit hard to just talk about in car smoke as there don't seem to be many studies based on just that criteria
what i fnd funny in that article they are quite willing to accept the study on theatrical fog /smoke
which i have no argument with any particulates in a confined environment which are capable of in air suspension and are small enough to enter the lungs and settle are almost always bad for you
but then they argue that the studies that show the same for second hand smoke are some conspiracy with drug companies ( cant realy see that they benifit from people being weller ( my word i like it so i am using it
)