Does ones inability to quit smoking shows of weak character?

I don't think it's got anything to do with having a weak character. I think there are several factors: how much you smoke a day (the more you smoke the harder it will be to give up), how long you've been smoking for (longer would be harder, more to do with the physical habit), how addicted you are. It's possible to smoke a lot for many years, and not to be that addicted. It sounds strange, but its to do with how different people's brains react to nicotine. Signs of being very addicted include needing to smoke as soon as you wake up, being unable to go without cigarettes for a couple of hours during work for example. Some people's brains are more highly rewarded with nicotine, leading to them becoming more addicted. I think motivation also comes into it, and also whether you actually really want to give up, which could be effected by how much of a risk you perceive smoking to be.