Sunlight-cured tobacco, Bastam, Iran Curing and subsequent ageing let for the sluggish oxidation and degradation of carotenoids in tobacco leaf. This generates specific compounds during the tobacco leaves and offers a sweet hay, tea, rose oil, or fruity aromatic taste that contributes into the "smoothness" on the smoke. 1970 https://broadfar.com/oraco-global-trends-in-heat-not-burn-products/