Some health risks are obvious, like smoking, or eating too much sugar. But what about renting? As many as a million Australians live in housing that harms their health, with renters the worst off. So what's the health cost of having so much substandard housing? And how do you even begin to fix a problem like that? Featured: Alice, Sydney tenant Professor Rebecca Bentley, Director of the Centre of Research Excellence in Healthy Housing, National Health and Medical Research Council (NHMRC) Dr Kim Loo, General Practitioner