Leonard Nimoy, who recently disclosed his COPD diagnosis, appeared on Piers Morgan Live on Monday to discuss the disease and the years of smoking that caused it.

“People were being told smoking is terrific,” Nimoy recalled, discussing the cigarette industry’s old marketing campaigns.

“You have to treat it as an addiction and understand that it’s not too early to quit,” Nimoy warned. “Young people think, ‘Maybe in 10 years I’ll quit,’ you know?’ “The damage is being done right now. Every day you light a cigarette, you’re losing cells in your lungs.”

Watch a segment of the interview below.

Nimoy commented on Twitter, prior to the appearance.

via CNN