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