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They had protection, but they climbed it free

doi: 10.1093/ntr/ntad067

Regarding long-term effects in the general population with a history of smoking, a controlled 1-year follow-up study found that changes in exhaled nitric oxide (FeNO) were significantly correlated with those of exhaled carbon monoxide (COe) throughout the follow-up, mainly a relative increase in the first 3 months followed by a significant increase at 6 and 12 months (53)

Dave, E-Cigarettes and Adult Smoking: Evidence from Minnesota, National Bureau of Economic Research, December 2019, [75] Victoria R

Of course the sticks were much thinner than an actual cigarette, so the effect was weak

Known as Kent Cigarettes, in the first four years following its introduction between 1952 and 1956, its believed that an estimated 13 billion were sold