Sun-cured tobacco, Bastam, Iran Curing and subsequent ageing enable with the sluggish oxidation and degradation of carotenoids in tobacco leaf. This creates sure compounds while in the tobacco leaves and offers a sweet hay, tea, rose oil, or fruity aromatic flavor that contributes towards the "smoothness" from the smoke. https://broadfar.com/heated-tobacco-shaping-a-safer-sustainable-smoking-future/