Okay...before this starts going down the tube, so to speak, let's look at it logically.
If you know that there could, and probably will be, those on your plane that will be negatively impacted by the smell of something, why risk bringing it? To the poster who said you would probably be okay and smelling play-doh is better than listening to kids cry for a flight....if the stuff isn't brough onboard in the first place, no crying will occur.
There are plenty of less objectionable things you can bring with you. I like the smell of Play-doh, but my dh gets physically nauseated when he smells it.....used to love playing with it, now have to moosh it around when he isn't there!!!
Just try to be sensitive to other travelers. Leave the heavy colognes, sardine sandwiches, play-doh all at home. One person's idea of a lovely smell could very well be someone else's nightmare.