Sunlight-cured tobacco, Bastam, Iran Curing and subsequent growing old make it possible for with the sluggish oxidation and degradation of carotenoids in tobacco leaf. This generates selected compounds in the tobacco leaves and provides a sweet hay, tea, rose oil, or fruity aromatic taste that contributes into the "smoothness" https://broadfar.com/nuso-heated-tobacco-smarter-alternative-to-traditional-smoking/