Fig. 2From: Concentrations of nicotine, nitrosamines, and humectants in legal and illegal cigarettes in MexicoHumectants and pH mean levels by brand, according to legal status (Mexico 2014). The global mean of propylene glycol levels for legal brands were 5.9 mg/g and for illegal brands it was 4.44 mg/g. For glycerol, it was 12.98 mg/g for legal brands compared to 2.95 mg/g for illegal brands. And for pH, it was 5.39 for legal brands and 5.30 for illegal brandsBack to article page