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The residue may be nearly invisible while the odor remains strong

Zep Smoke Odor Eliminator The fresh, professional-strength aroma of Zep lasts for an extended period of time and leaves the air smelling crisp and clean.

And this despite the fact that smoking still represents the greatest threat to human health, directly causing 93,000 more deaths than alcohol, drugs, road accidents, AIDS, homicide and suicide combined

Flavor molecules, reacting with the propylene glycol in the e-liquid, can produce metabolites, or intermediate substances that are part of metabolic reactions, that are irritating to the respiratory system