Leonard Nimoy, whose role as the brilliant Spock on “Star Trek” made him a household name, announced on Twitter this week that he’s suffering from a chronic disease brought on by smoking.

Nimoy wrote on the micro-blogging site that he was recently diagnosed with COPD, or chronic obstructive pulmonary disease, and urged his followers to take heed and quit smoking before it’s too late. The news comes on the heels of a photograph that’s been circulating on the web which shows the 82-year old actor in a wheelchair with an oxygen tank.

Nimoy was photographed being helped through an airport, raising alarm in his fans until he made the official announcement.

I quit smoking 30 yrs ago. Not soon enough. I have COPD. Grandpa says, quit now!! LLAP

— Leonard Nimoy (@TheRealNimoy) January 30, 2014

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.

— Leonard Nimoy (@TheRealNimoy) February 6, 2014

The disease can cause shortness of breath and symptoms of emphysema and bronchitis, and sufferers often need to supplement their oxygen intake. The progressive disease also reportedly quadruples the risk of lung cancer; however, Nimoy seems determined not to let the illness take over and has been as busy as ever, updating his Twitter account daily for his fans.

Trek Fest coming to EPIX on 2/16. I'll be there. Join me. LLAP

— Leonard Nimoy (@TheRealNimoy) January 25, 2014

So I have made a new and special signed print at http://t.co/sLprXOBENV, It's availavable now. Have a look. LLAP

— Leonard Nimoy (@TheRealNimoy) February 6, 2014

Mr. Nimoy updated his page today, letting his 809,000 followers know he’s okay.

I'm doing OK. Just can't walk distances. Love my life,family, friends and followers. LLAP

— Leonard Nimoy (@TheRealNimoy) February 6, 2014

Image via Wikimedia Commons