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