Herb vaping produces carbonyls in mainstream smoke

In recent years there has been a shift towards herb vaping; however, there are very few studies determining the compounds emitted. This work studies the carbonyls emitted in the mainstream emissions of a herb vaporizer using: chamomile(CHAM), cannabis(CANN), thyme(THYM), lavender(LAV), passiflora(PASS), green tea(GREEN), eucalyptus(EUC), at 215 and 225°C, under International Organization for Standardization (ISO) and Health Canada Intense (HCI/CAN) puffing regimes. The carbonyls are collected in acidified DNPH solution and analyzed by HPLC-UV. Five carbonyls were detected. Formaldehyde, propionaldehyde and crotonaldehyde were below the limit of detection. Acetaldehyde and butyraldehyde were found to be predominant in the carbonyl content of herbs. The first is found at 2-5 times higher concentrations than the latter. The results (Fig 1, Fig 2) show that emission of carbonyls increase with temperature. The impact of smoking regime is not clear. There is a high variability on the emission of carbonyls as a function of herb. CANN emits more acetaldehyde than the other herbs, while CHAM is the herb that emits the most butyraldehyde. Fig 1. Emission of acetaldehyde <fig><object-id>erj;64/suppl_68/PA4030/F1</object-id><object-id>F1</object-id><object-id>F1</object-id><graphic></graphic></fig> Fig 2. Emission of butyraldehyde <fig><object-id>erj;64/suppl_68/PA4030/F2</object-id><object-id>F2</object-id><object-id>F2</object-id><graphic></graphic></fig>