will increase your heart rate
thus increasing your blood pressure temporarily after smoking. In the longer term it causes atherosclerosis
, which is hardening of the arteries, causing high blood pressure
as the artery will be less compliant so the rise of pressure will be greater for each volume of blood pumped by the heart. ( a bit of physics here that i am not an expert on)
If you stop smoking you blood pressure will go down because there is a reduction of the heart rate.
Hope that helps