1.   Being seriously overweight doubles the risk of heart disease.

2.   Not having children or having them late in life doubles the risk, as does heavy alcohol consumption.

3.   Workers in the nuclear industry could face up to double the risk of contracting leukaemia than the rest of society according to a report published today.

4.   At a meeting a year ago, the researchers presented preliminary results showing that anger doubled the risk of heart attacks.

5.   At the very least, smoking will double the risk of SIDS.

6.   Additionally, diabetes doubles the risk of a second heart attack in women, but not in men.

7.   Both low fitness and smoking nearly doubled the risk of early death for men and women, Blair said.

8.   Compared with the control group, cell phone users had more than double the risk of developing the tumor.

9.   Depression and repressed anger also were strongly associated with impotence, with depression nearly doubling the risk of moderate to complete erectile dysfunction.