“I did think about giving up smoking, but I decided not to, because I'm not a quitter. And I know that every cigarette I smoke takes five minutes off my life, but I also know it takes ten minutes to smoke it. That's a clear five-minute net gain, I reckon.”

Holidays in Hell (1989)

Source: A Million Little Pieces

Will Hodgkinson (December 16, 2004) "Comedy's overgrown schoolboy", The Irish Times.

There is no indication that Einstein said this. According to Quote Investigator, the earliest publication of a quote similar was in a collection of articles about manufacturing in 1966, when an employee of the Stainless Processing Company wrote a piece titled "The Manufacturing Manager's Skills." The article attributed the quote to an unnamed professor at Yale, by saying, "If I had only one hour to solve a problem, I would spend up to two-thirds of that hour in attempting to define what the problem is." (See, 1966, The Manufacturing Man and His Job by Robert E. Finley and Henry R. Ziobro, "The Manufacturing Manager's Skills" by William H. Markle (Vice President, Stainless Processing Company, Chicago, Illinois), Start Page 15, Quote Page 18, Published by American Management Association, Inc., New York. Verified on paper). https://quoteinvestigator.com/2014/05/22/solve/
Disputed
Variant: If I had an hour to solve a problem I'd spend 55 minutes thinking about the problem and 5 minutes thinking about solutions.

July 3, 1998 Denver Post column

Rolling Stone interview (1988)

Willie Nelson: Road Rules And Deep Thoughts, NPR Staff, NPR.org, National Public Radio, November 18, 2012, November 18, 2012 http://www.npr.org/templates/transcript/transcript.php?storyId=165223056,