This reminds me of when I found an aerosol can of suede protector in my sons bedroom when he was about 13. I panicked, thinking it must be something to do with aerosol abuse as it would never have occured to him to clean his trainers, let alone spray them with suede protector! When I mentioned it to him he said 'Mum we spray the bearings on our skateboards with that, it protects them when it rains!' Talk about jumping to conclusions!!!
I think my 17 year old granddaughter is sniffing sure deodorant. She dd it when she was 14 and we thought when we confrnted her with it she would stop. The signs are here again. She is very angry and argumenative, she is extremely overweight and her face is full of spots. She was in my house and when I went upstairs to check on her she was rubbing her nose profusely. I noticed the sure was not where it normally is , I called her to come downstairs,went back up and it had been put back in the cupboard and emptier than it was when I used it in the morning. Since the episode when she was 14 I constantly check the deodorants all the time without her knowledge. I never said anything to her should I have what do you think. Her parents are going through a divorce so her life is in a bit of upheaval at the moment.
Signs of aerosol abuse include: white marks on towels or t-shirts and/or wet towels or t-shirts; looking ill: spotty face, red and blotchy, red eyes; mood swings... There's more info here: www.talktofrank.com/drug/glues-gases-and-aerosols. If he's doing OK at school and you haven't noticed any changes in him, it doesn't sound very likely, to be honest... And also, aerosol misuse doesn't seem to be very popular or common these days. If he wanted to mess about with drugs, he'd be more likely to try skunk and/or m-cat...
Having a 19 year old brother, I can confirm that Lynx is known as "shower in a can" and pretty much every male smells of some branch of it. You never know with teenagers. He could have just dropped them on the floor because they're empty and taking them to the bin was too much like hard work.
Ok I had friends in school that used to do this. Water bottles are nothing to do with sniffing cans, what you need is a tshirt that you scruch up as you inhales the aresole through the tshirt. So any material with huge deep white warks you need to be concerned, not just 2 empty cans.