Sun-cured tobacco, Bastam, Iran Curing and subsequent getting old allow to the sluggish oxidation and degradation of carotenoids in tobacco leaf. This generates specific compounds in the tobacco leaves and offers a sweet hay, tea, rose oil, or fruity aromatic taste that contributes to your "smoothness" of your smoke. https://trentonatkct.wikicorrespondence.com/4558338/smoking_fundamentals_explained