Sun-cured tobacco, Bastam, Iran Curing and subsequent aging allow with the sluggish oxidation and degradation of carotenoids in tobacco leaf. This creates certain 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. Fire-cured https://broadfar.com/heated-tobacco-shaping-a-safer-sustainable-smoking-future/