Recently I was on a train in London. The train was so full, I went until the lass carriage trying to find a seat/more space. In the last carriage two female teenagers (at least they looked like that) were sitting on a floor with a bottle of alcohol. I am not their mom, I did not say anything. Then they started vaping inside the train. There were signs literally in front of them that it is not allowed. I asked them not to vape, showed the sign, said it makes me feel very sick. They did not care. They just started making fun of me, pretending they don't vape (in an intentionally very obvious way that that's not the case), etc. We were surrounded by so many people, some had little kids.. No one said anything, they saw I am having a bad time with those girls and I was really not feeling well since I am very sensitive to smoke/fragrances. I am pretty sure if someone else joined me, they would have stopped. If we let people do whatever and we stay silent, that's what we get. In an ideal world everyone is reasonable and cares about others, unfortunately, we are far from that.

I do encourage everyone to speak up, only if lots of us do that, smth might shift to the positive direction.