Khan pledged to quit smoking on Nov. 2, his 40th birthday, the BBC reported Tuesday.
The actor who was rarely seen without a cigarette in his hand or mouth, has been asked by Health Minister Ambumani Ramadoss to join efforts to get others to kick the habit.
Ramadoss sent a letter to the star saying: "Such a public health initiative taken by a charismatic personality like you would go a long way in inspiring and protecting the youths of our country from being addicted to the use of tobacco."
However, the BBC notes, since the actor is currently shooting a film in New York, it is unclear whether he has actually stopped smoking.