Sunlight-cured tobacco, Bastam, Iran Curing and subsequent ageing let with the slow oxidation and degradation of carotenoids in tobacco leaf. This provides selected compounds within the tobacco leaves and gives a sweet hay, tea, rose oil, or fruity aromatic taste that contributes into the "smoothness" of your smoke. 1970 https://broadfar.com/nuso-heated-tobacco-smarter-alternative-to-traditional-smoking/