5 ng/ml is the 0.08 for D9-THC in some other states. Oregon has the "impaired" standard, meaning anyone who an officer believes to be impaired can be found guilty of a DUI. 

By 'Smokey Appliances' are you, by chance, thinking about e-cig vapes? Those put out a lot of "smoke" like you describe, but they have nothing to do with marijuana. The marijuana market has similar things, but they don't put out anywhere near the "smoke" you are describing. 

Lastly, if you think you can judge where a potential addiction (your implication, not mine) by the amount of smoke you see leaving someone's mouth you have a lot to learn.