Sunlight-cured tobacco, Bastam, Iran Curing and subsequent ageing allow for with the slow oxidation and degradation of carotenoids in tobacco leaf. This generates specific compounds in the tobacco leaves and gives a sweet hay, tea, rose oil, or fruity aromatic taste that contributes on the "smoothness" on the smoke. https://nmate82468.dbblog.net/6895546/rumored-buzz-on-tabacco