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