Consistent marijuana smell in my apartment which i...

Consistent marijuana smell in my apartment which is supposed to be a non-smoking building. I gave video evidence of smoke coming out of a neighboring apartment window, and the offending tenants were able to convince management that it was incense. Now, a few months later, building management is saying they don't know where the smell is coming from, so all they can do is send a text message to everyone. I'm paying a fortune in rent for a place that smells like a skunk's toilet.

UPDATE:
I will say that I've been pleasantly surprised. The marijuana smell has gone away for the past 3 months. Unfortunately, I was not aware if it was because of some action by building management or if the offending person left or had some lifestyle change. It has just come to light that management did confirm that people were smoking in the building and have taken steps to remedy, and the steps have been effective thus far. I likely won't post further after this, so here is a summary of the pros and cons:
Cons:
-It was only in response to these reviews that my issue was eventually taken seriously. Going through the usual channels didn't result in anything. That's tough to get over.
-Communication still continues to be an issue in that I had no idea that action was taken and continued to dread coming home for fear of discovering the smell again.

Pros:
-Management seems to have taken this issue to heart. They seem to have changed how they respond to issues and the repeated dismissive responses I initially received seem to be something they are rooting out. Assuming that continues, then LBPM is worth considering.
-They've changes their standard operating procedures for identifying and remedying some of the other issues I was having because of my feedback.
-I'm cautiously optimistic that they might have some good people now in the right places in management so that they have the ability to do right by their tenants.