Star Trek actor Leonard Nimoy revealed last week on Twitter that he has been diagnosed with chronic lung disease, and on Thursday, Nimoy wrote on his Twitter account urging his 810,899 followers to quit smoking.

The 82-year-old, known for playing the Vulcan-human Spock on the original "Star Trek" series, wrote that he has developed chronic obstructive pulmonary disease, or COPD, despite having stopped smoking 30 years ago.

“Smokers, please understand. If you quit after you're diagnosed with lung damage it's too late. Grandpa says learn my lesson. Quit now. LLAP,” he wrote adding in another tweet: “I'm doing OK. Just can't walk distances. Love my life, family, friends and followers. LLAP.”

Nimoy was reportedly spotted at an airport recently, wearing an oxygen mask in a wheelchair.

"COPD is an umbrella term used to describe progressive lung diseases including emphysema, chronic bronchitis, refractory (non-reversible) asthma, and some forms of bronchiectasis. This disease is characterized by increasing breathlessness,” according to the COPD Foundation.

Nimoy played the role of Spock in the first version of the science-fiction drama in the late sixties and last appeared on screen in 2013 to reprise his role in “Star Trek Into Darkness.” He has also directed two of the franchise’s films, “The Search for Spock” and “The Voyage Home.”

Nimoy continues to be involved in anything associated with “Star Trek,” he wrote on his Twitter account on Thursday: “Just taped my comments for Star Trek Fest to be aired on EPIX Feb. 16th. Still enjoying my life. LLAP.”