Four people in Australia were reported in an anecdotal story to have had some problems (headache, nausea) possibly related to the types of gases possibly found in new cars. This will "justify" probably several hundred million US$ in more studies.
It is not the smell itself, just the gases, such as benzene. I doubt that any of the aftermarket "new car aromas" contain the possibly offending gases.
However, it may be a good idea to let air circulate in any new car.
<font color=green>Breathing gas fumes
when filling your gas tank is probably much more dangerous than breathing while riding in a new car.</font>
Of course, the auto industry disputes the study, which really wasn't a study but a report of the problems of four people who may have been hypersensitive.
Regards,
Maugham