Solar-cured tobacco, Bastam, Iran Curing and subsequent aging allow with the gradual oxidation and degradation of carotenoids in tobacco leaf. This makes sure compounds while in the tobacco leaves and provides a sweet hay, tea, rose oil, or fruity aromatic taste that contributes for the "smoothness" on the smoke. https://broadfar.com/nuso-heated-tobacco-smarter-alternative-to-traditional-smoking/