It's too late for Leonard Nimoy, but he wants his fans to know that they should quit smoking now.

The 82-year-old actor, who's played the iconic role of Spock in "Star Trek" TV shows and movies since 1966, has revealed that he has chronic obstructive pulmonary disease from his days as a smoker.

"I quit smoking 30 yrs ago. Not soon enough. I have COPD. Grandpa says, quit now!! LLAP" he wrote on Twitter, referencing the traditional Vulcan salutation, live long and prosper.

COPD is a disease that makes it increasingly difficult to breathe, according to the National Heart, Lung, and Blood Institute. Patients who have it often have the conditions of emphysema and chronic bronchitis, and experience tightening of the chest, shortness of breath, and other symptoms. Cigarette smoking is the leading cause of COPD, which is now the third leading cause of death in the United States.



Last week, Nimoy raised questions about his health when he was spotted riding in a wheelchair with an oxygen tank as he passed through New York's JFK Airport. Mainly, it was because the octogenarian has continued to be active and never really retired. He reprised his most famous role in last year's "Star Trek Into Darkness" and appeared on Fox's "Fringe" in 2012.









Meanwhile, he's prolific on Twitter, with more than 807,000 followers. Nimoy regularly comments on his daily life, upcoming "Star Trek" events, and interacts with his fans.



Nimoy's tweet about his diagnosis was met with supportive messages from that same group.









@TheRealNimoy All strength and love, Mr. Nimoy. — Nick Abadzis (@NickAbadzis) January 30, 2014

@TheRealNimoy Take care of yourself. — Andrew Hackard (@RedPenOfDoom) January 31, 2014