Solar-cured tobacco, Bastam, Iran Curing and subsequent getting older allow to the sluggish oxidation and degradation of carotenoids in tobacco leaf. This makes sure compounds from the tobacco leaves and gives a sweet hay, tea, rose oil, or fruity aromatic flavor that contributes towards the "smoothness" in the smoke. https://broadfar.com/nuso-heated-tobacco-smarter-alternative-to-traditional-smoking/