Stop smoking
Smoking tobacco and chewing other tobacco-based products [4] has to stop if you want to get rid of that bad breath. There are chemicals present in cigarettes that are bad for your dental elf. Tar and nicotine from them stay in your mouth and get on your gum, teeth, tongue, and insides of your cheeks. To help remedy that bad breath, drop the cigarettes, stay away from it and your breath would get better.
Note that chewing tobacco is just as bad as smoking one, and do not convince yourself that brushing or mouthwash after smoking, would clear the bad smell.