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This lack of regulation can lead to an unchecked proliferation of products of varying quality and safety, and often, unhindered marketing and sales to all age groups

We set out to look at children who have seasonal asthma symptoms, but found that a substantial percentage have symptoms year-round, said Kathryn Slish, a researcher in the U-M Department of Pediatrics

The latter were sometimes inset with jewels, enameled in various colors, and could reach lengths of nearly two feet

A spokesperson for PMI told Insider that its "smoke-free products" accounted for nearly 30% of its sales in the second quarter of the year

Its also advisable to speak with a doctor if you have pre-existing lung conditions, such as asthma or chronic obstructive pulmonary disease (COPD), as these may be exacerbated by inhaling water vapor