While planes rarely have onboard ice machines, they do get their ice delivered from third-party services. And, according to a 2017 peer-reviewed study published in the Annals of Microbiology, ice is, quite bluntly, a little gross.
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Never Ask for Ice on an Airplane — Plus More Air Travel Food Tips.
You should only carry the amount you need for your trip. If the label on the medication or medical confirmation states that medication must be kept cool, you may carry an ice pack or cooling gel pack in cabin baggage. These will need to be removed for separate screening.
The FAA limits you to 5.5 pounds of dry ice that is properly packaged (the package is vented) and marked. Airline approval is required. For more information, visit the FAA website.
Electronic smoking devices are allowed only in carry-on baggage. Passengers are required to take effective measures for preventing accidental activation of the heating element of the device when transporting the devices.
If icing occurs, it should be reported as Trace, Light, Moderate or Severe. Here's a link to a tool that forecasters use to determine icing severity and probability: To avoid areas of icing, look for any reports of icing and AIRMETs on the route of flight before departure.
The fine for smoking or vaping on a flight can range from $2 to $4,000, and by itself is not a jailable offense. However, it can quickly escalate if a person is found to have tampered with a smoke detector, or failed to comply with a crew member's instruction, such as to stop smoking.