Lots of people dabble in this type of stuff now and I think, whilst it is natural to a degree, that some are purely bored or pressured into it. You can't tell people to stop doing stuff that may hurt them because they have to make their own mistakes. I used to think being a good friend was trying to prevent people from getting hurt by others but I have changed my mind. I think we are all responsible for ourselves and if some people get hurt that is their choice, their tough luck and their karmic path. It is very different with vulnerable adults and children, we all have a duty to watch out for them, but as far as I am concerned everyone else is exercising free will and all any of us can do for our friends is to be there to help pick up the pieces when stuff goes wrong, if we choose to. You have made your feelings known so you can sleep easy.