I'm going with option 3. 1 and 2 probably do count for something but there's definitely something very wrong compared to the 80s and onwards.  

 It's a silent war 

 Three reasons that have absolutely nothing to do with poisoning. 

1) The more you look, the more you find. 

2) Society has become more sensitive. 

3) The DSM has consistently lowered the definitional thresholds of what is considered mental illness. It's a business model.