I saw kids under the age of 10 happily waving them around at the parade. Not something I’d advocate, of course, but as you say it shows how popular and widespread they are at the moment.Flares give off a flame and cannot be extinguished
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Smoke grenades give off smoke and can be extinguished
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Throwing either on the pitch is pure stupid behaviour. But have a look at Glastonbury over the weekend to see how many are let off and see how popular they are.