Mr Obama has battled cigarette addiction for years, but press secretary Robert Gibbs said that he has not seen any evidence of the president having a cigarette since March, when he was advised by doctors after a routine medical examination to quit.
Mr Gibbs told CNN that Mr Obama “has done enormously well in quitting”.
“It was a commitment that I think he made to himself at the end of the health care and with his two daughters in mind,” he said.
Mr Gibbs said Mr Obama has helped to overcome his habit by chewing Nicorette gum.
During the presidential campaign, Mr Obama vowed to quit smoking. However, since moving into the White House, he admitted there were times when he had “fallen off the wagon” and smoked an occasional cigarette.
The news that he has not smoked for nine months will come as a relief to the First Lady, who has constantly badgered her husband to give up his reported two-decade habit.
Michelle Obama – a zealous anti-smoker – only supported her husband’s presidential campaign on condition that he quit. [via The Telegraph (UK)]