hand ▁smoke ▁include ▁the ▁U . S . ▁National ▁Can cer ▁Institute , ▁the ▁U . S . ▁Cent ers ▁for ▁D ise ase ▁Control ▁and ▁Pre vention ▁( CD C ), ▁the ▁U . S . ▁National ▁Instit utes ▁of ▁Health , ▁the ▁Sur geon ▁General ▁of ▁the ▁United ▁States , ▁and ▁the ▁World ▁Health ▁Organ ization . ▁ ▁Air ▁quality ▁in ▁bars ▁and ▁restaur ants ▁Rest rict ions ▁upon ▁sm oking ▁in ▁bars ▁and ▁restaur ants ▁can ▁substantial ly ▁improve ▁the ▁air ▁quality ▁in ▁such ▁establish ments . ▁For ▁example , ▁one ▁study ▁listed ▁on ▁the ▁website ▁of ▁the ▁U . S . ▁Cent ers ▁for ▁D ise ase ▁Control ▁and ▁Pre vention ▁states ▁that ▁New ▁York ' s ▁state wide ▁law ▁to ▁eliminate ▁sm oking ▁in ▁en closed ▁work p laces ▁and ▁public ▁places ▁substantial ly ▁reduced ▁R SP ▁( res pi rable ▁susp ended ▁particles ) ▁levels ▁in ▁western ▁New ▁York ▁hospital ity ▁ven ues . ▁R SP ▁levels ▁were ▁reduced ▁in ▁every ▁ven ue ▁that ▁permitted ▁sm oking ▁before ▁the ▁law ▁was ▁implemented , ▁including ▁ven ues ▁in ▁which ▁only ▁second - hand ▁smoke ▁from ▁an ▁adjacent ▁room ▁was ▁observed ▁at ▁bas eline . ▁The ▁CD C ▁concluded ▁that ▁their ▁results ▁were ▁similar ▁to ▁other ▁studies ▁which ▁also ▁showed ▁substantial ly ▁improved ▁ind oor ▁air ▁quality ▁after ▁sm oking ▁b ans ▁were ▁instit uted . ▁ ▁A ▁ 2 0 0 4 ▁study ▁showed ▁New ▁Jersey ▁bars ▁and ▁restaur ants ▁had ▁more ▁than ▁nine ▁times ▁the ▁levels ▁of