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Depending on the cruise line policy and what the item is, it may be held and returned to you at the end of the cruise or it may just be confiscated

The guideline specifically states: Eye doctors should ask about and document their patients smoking status and inform them about the benefits to their eyes, vision and overall health, through smoking cessation counseling and educating patients about the potential impact of smoking may help maintain ocular and systemic health, and visual function. Doctors seeking additional information for helping facilitate patient conversations on smoking cessation can make use of these resources: Contact Lenses, Smoking and Vaping patient pamphlet available on AOA Marketplace

As youll see, there are many benefits of activated charcoal

That said, these items are not allowed on cruise ships