@hawkeye10,
Nope, it's a fact. However, he did quit smoking decades ago either before or when they removed a cancerous vocal cord.
"Klugman, who lost his voice to throat cancer in the 1980s and trained himself to speak again, died with his wife at his side."
"“The only really stupid thing I ever did in my life was to start smoking,” he said in 1996."
"He said seeing people smoking on television and films “disgusts me, it makes me so angry - kids are watching”.
"When Klugman lost a vocal cord to cancer in 1989, it was Randall who insisted Klugman could bounce back.
“My career was over,” Klugman told USA TODAY in 1997, when he reunited with Randall on Broadway for Simon’s The Sunshine Boys.
“I couldn’t even swallow: I had to lay on my side. I lived alone, could barely whisper. I cut off everybody.”
But when the two old friends teamed up for an Odd Couple benefit performance, “everybody was crying,” Klugman recalled, performing a waterfall of tears with his fingers. “The cast, the audience, these people who had paid $1,000 a seat.”