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According to Altria, the market share or retail share results for cigarettes are measured based on the following assumption: Retail share results for cigarettes are based on data from IRI/Management Science Associates, Inc., a tracking service that uses a sample of stores and certain wholesale shipments to project market share and depicts share trends

However, that doesnt mean it was legal or safe

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Clark suggests that the fact that market trends have swung back in favor of smaller-form cartridges may also play a role: because they are smaller, theyre easier to misplace, so it makes sense these products would be lying around and kids would be getting ahold of them. But probably the biggest factor is the simple fact that until very recently, vaping has been on the rise among adults, with one market research firm estimating that the number of vapers worldwide will hit 55 million by 2021