You can't get burned by a smoke cannister
You say that but even a manufacturer of smoke cannisters selling online states on their website:
Enola Gaye smokes are designed to be used in close proximity to people but you cannot breathe the smoke and applies to all types of smoke. You can be in the smoke, but with any smoke it can cause breathing difficulties, especially if people are asthmatic.
Then;
Yes it can stain if held close to the material. We would not advise using our smoke products close enough to stain material as this would also create a fire risk. From our tests materials within 2 meters of the nozzle of the smoke may become stained from the smoke dye.
So;
- causes breathing difficulties, especially for people with asthma
- stains clothes
- if held close to material causes a fire risk.
I'm not the fun police. I like an atmosphere at games I attend, hence frequent trips to Europe, but I find that atmosphere is achieved through volume of singing/chanting, not some coloured smoke.
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From reports of smoke bomb use in the Netherlands, 2017;
PSV's Eredivisie clash with Ajax had to be halted after smoke bombs were set off in the stands.
Supporters of PSV set off the bombs in protest against recent banning orders in Dutch football.
Fourteen people were hospitalised as thick plumes of smoke engulfed sections of the Philips Stadion on Sunday afternoon.
Ten fans and four security guards all received treatment for respiratory issues.