Solar-cured tobacco, Bastam, Iran Curing and subsequent growing older let to the gradual oxidation and degradation of carotenoids in tobacco leaf. This provides sure compounds in the tobacco leaves and provides a sweet hay, tea, rose oil, or fruity aromatic flavor that contributes towards the "smoothness" of the smoke. https://edwintjwjv.birderswiki.com/1316792/the_definitive_guide_to_tabacco