How would you do it - A little Puzzle - Enjoy

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I remember a small puzzle, that somebody asked me long ago, when I was a child, way back in 1970's. You also try it out. Let's see how many can come up with the right answer: There are ten packets of 10 cigarettes each, numbered 1 to 10. But one of the packet contains doped cigarettes and the remainig nine packets are okay. The weight of each doped cigarette is just 0.1 gram more than the normal cigarette. You are allowed to weigh only once and recognise the packet containing doped cigarettes. No other methods for recognising are allowed. so get ready and scratch your head a little