Veteran actor Leonard Nimoy, best known as Spock in the television series Star Trek and a string of feature films that followed, said he was "doing OK" after being diagnosed with lung disease and urged fans to quit smoking.
"Smokers, please understand. If you quit after you're diagnosed with lung damage it's too late. Grandpa says learn my lesson. Quit now," Nimoy tweeted on Thursday to his 810,000 followers.
In Nimoy's case, the actor said, he was diagnosed despite having quit smoking 30 years ago.
The 82-year-old actor added he was "doing OK. Just can't walk distances," and he signed off with "LLAP", an abbreviation of his character's trademark Vulcan phrase, "live long and prosper".
Nimoy first revealed in a Twitter message posted last week that he has chronic obstructive pulmonary disease, a severe lung ailment that has been linked to smoking.
Nimoy has become synonymous with his role as the fictional half-human, half-Vulcan Spock.