Well, really you only need to google. There is SO much out there.
Here is a round up:
www.mc.uky.edu/tobaccopolicy/ResearchProduct/SecondhandsmokeandNicotine.pdf
More accessible, may be the American Cancer Society's summary:
Secondhand smoke causes other kinds of diseases and death.
Secondhand smoke (SHS) can cause harm in many ways. Each year in the United States alone, it’s responsible for:
An estimated 46,000 deaths from heart disease in people who are current non-smokers
About 3,400 lung cancer deaths in non-smoking adults
Worse asthma and asthma-related problems in up to 1 million asthmatic children
Between 150,000 and 300,000 lower respiratory tract infections (lung and bronchus) in children under 18 months of age, with 7,500 to 15,000 hospitalizations each year
Making children much more likely to be put into intensive care when they have the flu; they stay in the hospital longer, and they’re more likely to need breathing tubes than kids who aren’t exposed to SHS
In the United States, the costs of extra medical care, illness, and death caused by SHS are over $10 billion per year
Some studies have linked SHS to mental and emotional changes, too. For instance, a Chinese study has suggested that SHS exposure is linked to an increased risk of severe dementia syndromes. A UK study reported that women exposed to SHS during pregnancy were at greater risk for symptoms of depression during that pregnancy. More research is needed to better understand the relationship between SHS, dementia, and mental health.
Surgeon General’s reports: Findings on smoking, secondhand smoke, and health
Since 1964, 34 separate US Surgeon General’s reports have been written to make the public aware of the health issues linked to tobacco and SHS. The ongoing research used in these reports still supports the fact that tobacco and SHS are linked to serious health problems that could be prevented. The reports have highlighted many important findings on SHS, such as:
SHS kills children and adults who don’t smoke.
SHS causes disease in children and in adults who don’t smoke.
Exposure to SHS while pregnant increases the chance that a woman will have a spontaneous abortion (miscarriage), stillborn birth, low birth-weight baby, and other pregnancy and delivery problems.
Babies and children exposed to SHS are at an increased risk of sudden infant death syndrome (SIDS), upper respiratory and lung infections, ear infections, and more severe and frequent asthma attacks.
Smoking by parents can cause wheezing, coughing, bronchitis, and pneumonia, and slow lung growth in their children.
SHS immediately affects the heart, blood vessels, and blood circulation in a harmful way. Over time it can cause heart disease, strokes, and heart attacks.
SHS causes lung cancer in people who have never smoked. Even brief exposure can damage cells in ways that set the cancer process in motion. The Surgeon General estimates that living with a smoker increases the chance of getting lung cancer by 20% to 30%.
Chemicals in tobacco smoke damage sperm which might reduce fertility and harm fetal development. SHS is known to damage sperm in animals, but more studies are needed to find out its effects in humans.
There is no safe level of exposure to SHS. Any exposure is harmful.
Many millions of Americans, both children and adults, are still exposed to SHS in their homes and workplaces despite a great deal of progress in tobacco control. In fact, almost half of non-smokers and more that 60% of children in the US continue to be exposed.
On average, children are exposed to more SHS than non-smoking adults.
The only way to fully protect non-smokers from exposure to SHS indoors is to prevent all smoking in that indoor space or building. Separating smokers from non-smokers, cleaning the air, and ventilating buildings cannot keep non-smokers from being exposed to SHS.