The problem with your analogy though is that the doctor does have plans to actually help the problem too. It takes more time and effort to set up all the things needed to properly heal a bone, so in the mean time they try to help alleviate the symptoms in the mean time. The system' in place has no plans to actually address the real issues, so it's more like the doctor sent you out the door with painkillers and calls that good enough. Creating laws that attempt to curb cigarette habits might be worth pursuing if paired with actual legislation to handle the causes that drive people to their use.

Also, to me, it is worth looking at some of the other reasons people are draw to smoking. Tobacco companies pour tons of money into methods of encouraging smoking and vaping, with it being well know that some of this is targeted at young people. To be honest, and some may find this a bit of a stretch, I sometimes feel that these laws are a sort of collective societal victim blaming more then a benefit.

As another point, and I don't know if you know this, but banning something does not necessarily curb it's use (see alcohol prohibition in the US in the early 20th century). If anything prohibition just deregulates it, making it more dangerous for those who still continue to participate.