You say "a lot" and "all the time," but that is unlikely. If he is regularly using it, it isn't a "recreational" use, he's using as many use prescribed drugs, for some desired effect, which might actually be helping him in some way. As to health concerns, I'm more concerned about smoking tobacco. However, it is entirely unclear whether he is better off using it or not using it. However, the drug affects people in different ways, and dosage is important. There is much misinformation out there, the drug has been demonized, and shallow studies are cited as if proof.And we're not just talking about the massive collections of Rasta-themed i Phone backgrounds, here.There are apps out there that can make your cannabis experience safer, more effective, and more enjoyable. Attitudes are changing and you may be part of a shrinking group.