[ClearCase_guy]

Studies like this seem misguided to me. An analogy:

Would I mind if I got new neighbors, and their skin was a dark shade of brown? Not at all! Do you think I'm a racist?? The color of a person's skin is of no consequence.

Would I mind if I got new neighbors, and they embraced the Ghetto Hip-Hop Urban Trash culture? You're darn right I'd mind. I'd say "There goes the neighborhood" and I'd make plans to move. My principle worry would be that my kids would be influenced by a ruinous sub-culture.

Chemical relationships between marijuana and heroin are of no interest to me at all. But the sub-culture that embraces marijuana can be a bad sub-culture. Some folks who start off in the shallow end and end up in the deep-end of the pool. The culture is what's dangerous.

[tacticalogic]

Studies like this seem misguided to me.

Seems like you'd be interested in the study. The first step in approaching any problem is to understand clearly what it is. If the association is cultural rather than pharmaceutical then this should be valuable information.

[Hemingway's Ghost]

Chemical relationships between marijuana and heroin are of no interest to me at all. But the sub-culture that embraces marijuana can be a bad sub-culture. Some folks who start off in the shallow end and end up in the deep-end of the pool. The culture is what's dangerous.

I completely agree with this. There is a universe of difference between a person who smokes pot, and a person who smokes pot and becomes immersed in the whole "pot" lifestyle.