Extremely bad breath?

I have really bad breath in it's embarrassing every time I open my mouth it smells bad. I do smoke cigarettes and weed which I'm trying to stop doing. I brush my teeth and use everything but nothing works, it ruins my self-esteem. I usually have white buildup on my tongue which is bacteria but no matter how much I brush or scrape my breath still smells please help?
Extremely bad breath?
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