There are a variety of different reasons that children use marijuana it can be due to peer pressure or curiosity. Whatever the reason one thing is certain that it is very dangerous for children in many ways. Children who have untreated mental disorders or children who were abused are actually more likely to abuse marijuana. People thing that marijuana is not an adductive drug. In fact this is an urban legend. 1 in 11 people who have just tried marijuana develop addiction. So if your child is experimenting stop it. Stop it fast. More often than not it causes lower grades at school. This is because the drug has effects on learning and memory and even motivation for continuous users even after the high comes of. Often the drug causes sycosis and paranoia. This can let to dangerous acts during use. If you think your child is using there is no magic way to talk to them. Each child is different and you have to bite the bullet and do it.