Blood tests are not enough by themselves to confirm a diagnosis of Transient Ischemic Attack, commonly known as a mini-stroke. A diagnosis of Transient Ischemic Attack is usually made by showing symptoms and through brain… 

The major causes of a Stroke are high blood pressure, smoking, diabetes, high cholesterol, heart conditions such as Atrial fibrillation, obesity, physical inactivity, excessive use of alcohol, unhealthy diet, and the use of recreational drugs… 

Drug addicts are at a higher risk of getting a Stroke since most drugs are harmful to blood vessels as well as the heart and brain.

The organ most affected by a Stroke is the brain.