DD is 14. Due to the weather we've had a lot of her friends (7 or 8 mixed genders) round all weekend as they can't go out. They took over the top of the house (DD's bedroom, spare room, study) and I went up to check on them reasonably regularly. They appeared to be hanging round, playing music and watching TV and phones. All fine.
I went into her room last night to retrieve half our crockery. On the floor near the bin were two nos (nitrous oxide) canisters with another couple in the bin.
I was very very angry. Grounded her etc. However she claims to know nothing about them, says they weren't doing nos. I then got a long apologetic text from her friend... apparently she found the canisters in the pocket of the borrowed jacket she was wearing, panicked as her parents would be furious if they found them and ditched them. DD says she'd never be stupid enough to leave them in the bin that I empty but I'm not daft and I frankly don't think I believe her.
I've looked at FRANK and it seems like it's relatively harmless, non addictive and lasts a couple of minutes. Health issues few and far between but only with extreme use. However what am I missing? What can I share with her to get her to see that this is foolish? Her friends are all clever sporty children who do well. I'm really surprised as I wouldn't have thought they'd have been interested in this sort of shit. Shows what I know. I'm also really angry that it happened in my house when I was responsible for the other children.
Anyone know anything about this and how worried should I be?