why does cigarette smoke linger doesn't just stay in the air; it can in the spaces people live and work in. Secondhand and thirdhand smoke can leave harmful chemicals in the air and on surfaces Third-hand smoke' – chemical residue

Although the earliest clues to the physiological underpinnings of tobacco use first came to light in the 1920s and the first major and almost conclusive evidence of the effects of smoking on health was published in 1950, there is indication that the harmful effects of smoking, especially the effects of nicotine, and cessation have preoccupied society and healthcare professionals since the early twentieth century in Hungary (Figure 1) 10-12

That valued Juul Labs at $38 billion, making it worth more than Airbnb, Lyft and SpaceX at the time

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Smoking alters alveolar macrophage recognition and phagocytic ability: Implications in chronic obstructive pulmonary disease