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Comparison of the health-related outcomes for traditional cigarettes, e-cigarettes, heat-not-burn cigarettes and snus: a systematic review and meta-analysis Paulina Natalia Kopa-Stojak, Marharyta Sobczak, Rafal Pawliczak BMC Public Health 9

And these categories are important for two broader reasons

Plain packaging is recommended by guidelines on Article 11 (packaging and labelling) and Article 13 (tobacco advertising, promotion and sponsorship) adopted by the Conference of the Parties of the WHO FCTC

But many businesses are flouting the rules to take advantage of the booming demand

But in reality the agreement amounts to a lump sum annual tax on the tobacco industry