How bad is smoking pot?

I'm just curious, how bad is smoking pot (out of a bubbler/bong) for your lungs if you only smoke 2-4x a week? I also have a question about drug testing, if you're applying for a job and they require a drug test and you fail it, do they call the police or are you just denied of the job? What about drug tests at a phlegm checkup or blood tests at a hospital, if you fail is it just between you and your dr or do they call the police? I figure it's a whole lot healthier in comparison to ecigs and it's twice as healthy than cigs. I kinda think of it as breathing in camp fire smoke in a way, but maybe even healthier?
Source: Cystic Fibrosis Teenagers and Young People Forum - Category: Respiratory Medicine Authors: Tags: Teenagers and Young People Source Type: forums