Thank you tpe, ranchand, and child: TYVM for your most informative input! Now I won't have to Google this topic: If the Feds ever confiscate my laptop, I would not want THAT Google search showing up! LOL
Jack's acting ability--gasping, heavy breathing, etc., were typical responses to the high-altitude fireworks, were they not? So thanks to you three, we can throw out the concern about "discomfort"...for Jack, or anyone else...