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These mixed feelings show we need clear rules on vaping in public, especially in tight spaces like train carriages

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Encouraging the use of certain brands among current users is undoubtedly an important function of tobacco advertising.

Empirical estimates of demand often show curves like those in Panels (c) and (d) that have the same elasticity at every point on the curve

PMID 20182026

In addition, COs induction of HO-1 is likely also disease-relevant, as overexpression of HO-1 is protective in PD models 20,32,55 , polymorphisms in HMOX1 have been associated with PD 56 , and increased HO-1 levels have been reported in saliva samples in early PD 57