Sun-cured tobacco, Bastam, Iran Curing and subsequent getting old allow with the gradual oxidation and degradation of carotenoids in tobacco leaf. This provides selected compounds inside the tobacco leaves and offers a sweet hay, tea, rose oil, or fruity aromatic flavor that contributes into the "smoothness" with the smoke. https://jaspercwofv.wikibriefing.com/3266023/helping_the_others_realize_the_advantages_of_cigarettes