Their usefulness in tobacco harm reduction is unclear , but they could form part of future strategies to decrease tobacco related death and disease .
There is tentative evidence that they can help people quit smoking , but they have not been proven better than regulated medication .
people 's usefulness in tobacco harm reduction is unclear , but they could form part of future strategies to decrease tobacco related death and disease .
There is tentative evidence that they can help people quit smoking , but they have not been proven better than regulated medication .