Smoking is one of the single biggest risk factors for heart disease and stroke. The numbers of smokers is reducing thankfully. This does mean that the remainder of smokers are the more 'hardcore' smokers who are less likely to quite. The fact remains that qutting at any point in your life is of benefit.
There are a number aids to stopping, counselling, patches, gum and even electronic cigarettes. There has been some controversy about the use of these are the amount of nicotine may be unregulated. There is however some good evidence that they increase quitting rates.
Whatever you do, whatever it takes, just do it just stop.