Not if the total perceived benefit you yield from smoking outweighs the total perceived cost of the risk of it.
Each person has individual freedom and the right to choose what they do with each increment of time that is theirs to utilize. The actions each individual takes in each moment in time is what that individual perceives to yield them the most benefit.
If you decide to acquire a new skill you can utilize in your career for the next 2 hours, you perceive that to yield you more benefit than any other action in these next 2 hours. If you decide to post on Getbig about whether or not smoking is a weakness for the next 2 hours, you perceive that to yield you more benefit than anything for the next 2 hours. If you decide to sit on your ass, sleep, etc. the same applies...
"Why would we do things like watch TV, sit on our ass, etc... when it is apparent they don't yield the most benefit?" you may ask? Because deep down we think they do. In these cases we think the best momentary thing for us would be to relax for a while, to enjoy a show for a while, to rest, etc... and repeated actions become habits; things you tend to do automatically, because our brains reinforce that which we repeatedly perceive to yield us the most benefit.
"Then we are harming ourselves--it is clear these things are NOT yielding the most benefit!" you may say. So what's the problem? Energy. What's the solution?
Drink your own urine. That is what we are designed to do and if you do your energy will always be sky high.

The person who smokes does take into consideration the risk of smoking. However, all things accounted for, he or she still perceives the benefit they receive from smoking to be greater than the cost of the risk of smoking. It is fine and it is a personal choice on what is most beneficial to you. If you think the moments of relaxation benefit your life more than a longer life may, so be it. If you think the risk is greater than the benefit of the relaxation, you wouldn't do it. Maybe living a shorter, but more relaxed life, to you, is more valuable than living a longer, but less relaxed life.
The catch is, some of us need to reach a point of desperation (ex., cancer) in order to truly realize the magnitude of the risk--the potential damage.