Sunlight-cured tobacco, Bastam, Iran Curing and subsequent getting older permit to the sluggish oxidation and degradation of carotenoids in tobacco leaf. This produces certain compounds from the tobacco leaves and offers a sweet hay, tea, rose oil, or fruity aromatic taste that contributes to your "smoothness" with the smoke. https://broadfar.com/oraco-global-trends-in-heat-not-burn-products/