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Leonard Nimoy, best known as Star Trek’s ‘Spock,’ revealed he has chronic obstructive pulmonary disease, or COPD.

The 82-year-old actor posted via Twitter, “I quit smoking 30 years ago. Not soon enough. I have COPD. Grandpa says, quit now!!” and signed off with his signature close, “LLAP,” or “Live Long and Prosper.”

After followers expressed concern, Nimoy followed up several days later, tweeting, “I’m doing OK. Just can’t walk distances. Love my life, family, friends and followers. LLAP.”

According to the National Institute of Health, COPD is most frequently found in those who smoke or used to smoke. The disability is the third leading cause of death in the United States.

photo: WENN