Scientists have found a profound link to heavy smoking in the middle age and the risk of Alzheimer’s disease. This new study suggests that middle aged people have a 100% increased risk of the disease and other dementia illnesses. We’ve always known that smoking is a risk for heart disease and cancer, but this study proves that what’s bad for the heart can also be bad for the brain. As with most bad things, the more you smoke, the greater the risk. To give you an idea…compared to non-smokers, people who have a two-pack a day habit have a 157% increased risk of developing Alzheimer’s.