phlegm from smoking cigarettes can seriously damage your lungs. It causes mucus buildup, tar deposits, and inflammation, making the lungs larger than normal and harder to function. Healthy lungs are pink, clean, and inflammation-free. Don't Smoker's Phlegm Health Education Model
Description
This is due to your airways adapting to vapor, which feels different from traditional smoke

Pictured from left to right: Little Cigars, Cigarillos (untipped), Cigarillos (tipped), Large Cigar back to top of page Snuff (Dry or Moist for use in Nose or Mouth): Snuff is a type of smokeless tobacco
In extreme cases, the study authors noted rats had experienced atrophy, fibrosis, and necrosis

Additionally, those studies show that policy changes can prevent adverse population health outcomes of the sort we estimate

The FDAs King had long pushed for e-cigarette makers to remove flavorings that appealed to children