Which became first country in the world to require that a warning be printed on every cigarette?

Which became first country in the world to require that a warning be printed on every cigarette?

دنیا کا پہلا ملک کون سا ہے جس نے ہر سگریٹ پر وارننگ پرنٹ کرنے کا مطالبہ کیا؟
Explanation

In a first, Canada is poised to become the first country in the world to require that a warning be printed on every cigarette.