25mg of vitamin C is lost with every cigarette smoked!
Our UK daily requirement of vitamin C is 40mg a day so with 2 cigarettes you loose over the daily amount required for optimal functioning.
Sources of vitamin C: Kale, Kiwi and Papaya are the highest sources
Other great sources: Strawberries, Rasberries, Oranges, Raw spinach, Pineapples, Rocket
There's some research here that you can check out!