Sunshine-cured tobacco, Bastam, Iran Curing and subsequent growing old let for the sluggish oxidation and degradation of carotenoids in tobacco leaf. This generates sure compounds in the tobacco leaves and gives a sweet hay, tea, rose oil, or fruity aromatic flavor that contributes towards the "smoothness" on the smoke. https://broadfar.com/heated-tobacco-shaping-a-safer-sustainable-smoking-future/