Jeremy Piven is ending his run in Broadway’s Speed-the-Plow due to a condition caused by an elevated mercury count, Variety reports.

“I talked to Jeremy on the phone, and he told me that he discovered that he had a very high level of mercury,” playwright David Mamet curtly told the entertainment trade magazine late Wednesday. “So my understanding is that he is leaving show business to pursue a career as a thermometer.”

“The good news is that some really great actors will be helping out and stepping in, which to me is a sign of great heroism and friendship.”

A rep for Piven says the actor wanted to continue his Broadway run, but doctors advised him against it.