We have a section called 'The Dark Side' - Support, links and general advice about psychological and emotional problems resulting from drug use/abuse, mental health, and other every day issues.
I'm not sure that is what your looking for so there are a number of Harm Reduction threads around the site - just check to your drug of choice and there will probably be a section covering it. Meth is normally covered in our 'Other drugs' forum but you will see threads about it all over the place.
If there is anything else your looking for or if you need help around the site then please feel free to ask.