It's not lack of sympathy for those whom suffer, it's common courtesy. I'm not going to stop someone from self-destructive behavior if they are aware of the consequences and choose to engage in the action anyway. So long as they aren't infringing upon the rights of others in the process, I couldn't care less what they do. I will grant them that freedom, I will allow them to do as they see fit as a free person of this country. The individual does choose to smoke, and that choice is up to them. As I said, make a tire swing or hang yourself...it's entirely up to you.
As for addiction, it can be controlled if one chooses to control it. There are programs people can go to, medications they can take if they truly wish to stop. It is an addiction, so it is not easy. But what worthwhile thing in life is easy? So maybe you can't just stop smoking...that doesn't mean you are doomed to smoke for the rest of your life. There are means in which people can kick the habit, but the individual must choose this path. We are not as weak as some may make us out to be. We don't need the government to step in at every point to protect us from our own choices. This applies very well to the realm of smoking. The dangers are known and the information is out there...hell it's even on the pack of cigarettes you buy. There is no longer massive deception on the part of the company. Nicotine is horribly addictive, if you choose to smoke it will not be easy to stop. Smoking is very bad for you, it dramatically increases the probability of cancer and the longer you do it the higher that probability becomes. If you choose to smoke, it will be hard to stop. It will do damage to your body. These things are well known and documented. The government has done its job in this respect, it has given the correct information out to the people. Now it is up to the people to make up their own minds and choose their own paths. The government isn't here to prevent you from using your freedom to hang yourself. It can act to point out the dangers of hanging yourself....the choice is up to you.