429fa52b_ke_Campaign___strokechallenges__What_you_can_do
[Risk factor] Cigarette smoking Smoking causes about a two-fold increase in the risk of ischemic stroke and up to a four-fold increase in the risk of hemorrhagic stroke. [Why it affects stroke risk] Smoking promotes atherosclerosis and aneurysm formation, and stimulates blood clotting factors. [What you can do] 
Stroke risk decreases significantly two years after quitting smoking and is at the level of nonsmokers by five years.
NINDS Know Stroke Campaign - strokechallenges
What you can do