As already said, the issue is that it is not permitted in the stadium, so therefore it should not happen, so anyone doing so breaches the terms of their SC contract. Personally if anyone is daft enough to abuse their bodies with any such product, well that is their lookout, but when it interferes with anothers personal space, then they fall into the selfish category, just like those who cause misery when drunk. The problem is the law deals with drunk nuisances, it doesn’t cover blowing your strawberry flavoured breath in my personal space, causing me or anyone else, nuisance, alarm or distress in the same way, but my distress may well be significant to my mental as well as physical health. Just stand outside the ground vaping and be good boys and girls, it is a fair compromise as I see it.
As for the unknown long term effects, well they are that, simply unknown. I can imagine a time will come where it will be subject to excise duty, and I’d support that given we do not know what harm these chemicals ingested will cause down the line. It could help fund the NHS in some small way now, just in case. I mean do we know every vape is what it says it is anyway? Do we know whether there is a market for cheap home concocted chemically produced stuff that criminals can make a fast buck on while slowly harming the population, and how rigorously the vape markets are actually monitored for quality?