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Yes, there are

As was recently shown, the number of symptoms reported by JUUL users increased with increasing puff number 21 , suggesting these newer devices with higher puff numbers may be more likely to increase adverse health effects than earlier generation products that deliver low puff numbers

If tobacco smoke-induced lung carcinogenesis is a paradigm for e-cig carcinogenicity, then it will take at least another decade to have e-cig-related human lung cancer to show up. In other words, its going to take a long time studying people who vape to truly know how much risk there isand thats leaving aside the more immediate, potentially fatal dangers of using unregulated vaping products.

Follow-up within three to five days after the quit date to review progress and address any problems associated with an increased rate of success