smoking tobacco formaldehyde levels in e-cigarettes were previously 'underestimated', researchers find What Are Sherm Sticks? Risks,
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doi:10.1189/jlb.0406236

But Maine still failed to end the sale of flavored tobacco statewide

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10.1023/a:1021171129766 102

However, studies have shown that smoking may delay regression of these lesions and increase the risk of persistent HPV infections on the cervix