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Cannabis labelling and consumer understanding of THC levels and serving sizes.

Drug Alcohol Depend. 2020 Jan 24;:107843

Authors: Leos-Toro C, Fong GT, Meyer SB, Hammond D

OBJECTIVE: As part of cannabis legalization in Canada and several US states, regulations specify how THC levels should be labelled on products; however, there is little evidence on the extent to which consumers understand and use THC labelling to inform consumption amounts. The current study was designed to assess comprehension of cannabis-related information including communication of dose and strength of product on different labelling designs among young Canadians.
METHODS: Two experiments were conducted in October 2017 among Canadian youth and young adults aged 16-30 years as part of an online cross-sectional survey (N = 870). Experiment 1 randomized respondents to one of three labelling conditions (1=No Label, 2=mgTHC, 3=Doses). Respondents interpreted a recommended serving and number of servings contained in the package. Experiment 2 randomized respondents to one of four labelling conditions communicating THC level (1=No Label, 2=%THC, 3=mgTHC, 4=Traffic Light System). Respondents determined level of THC in the product.
RESULTS: Labelling the number of doses per package was associated with the greatest proportion of correct responses (54.1 %) when respondents had to determine a recommended serving compared with the no-label control condition (7.4 %) and THC mg condition (13.4 %). When cannabis products were labelled using a traffic light system, participants were more likely to identify THC level: low THC (85.1 %) or high THC (86.4 %) than the control condition (2.0 % and 5.2 % respectively).
CONCLUSION: Few consumers can understand and apply quantitative THC labelling; in contrast, THC labels that provide ‘interpretive’ information, such as descriptors, symbols, or references to servings have greater efficacy.

PMID: 32044091 [PubMed – as supplied by publisher]

Source: ncbi 2

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