do 100 cigarettes have more tobacco than regular How many are in a Pack? Box Agency Tobacco smoking - Wikipedia
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Products like Zyn don't need to be proven safe and effective for a specific population the manufacturer just needs to comply with "requirements under the law to bring its product to market," the FDA website says

Traditional and herbal medicine approaches for smoking cessation Traditional medicine systems encompass long-standing practices, beliefs, and natural remedies used for health promotion and treatment of illness (Addissouky et al

Being outside though might expose them to more pollens

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This then turns into vapour, which can be inhaled through the mouthpiece