Could only be 19
So it is illegal to carry anything with you that is
Quote:
any inflammable, explosive or corrosive gas, spirit, liquid, substance, or matter, or any article or thing which is or may become dangerous to any person or property.
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However its fine if its for personal use and suitably contained.
The trains are fully ventilated, its not so long ago smoking was allowed. It more an issue of a growing portion of the population having no respect to those around them, be it doing make up on the train (fun to watch when it goes wrong), or listening to something not worthy of the title music turned up way to loud.