Thank you.
Yes, the pyro Parkinsons connection has long been a concern. It has, in fact, been my concern since I started mixing chemicals in my father's darkroom as a kid in the 1950's; pyro included, of course.
Greater concern has occupied my mind since my father was diagnosed with Parkinsons in 1990,and died less than a decade later. He was a close friend of Edward's, took Edward on his last road trip to Death Valley in 1948, and learned the magic of pyro from Edward. There may be a connection, and you were wise to heed your mother's warning.
Merg