Cigarette smoking is symbolic of blasphemy of the Holy Spirit.
But it's not the blasphemy itself.
Getting incurable cancer from it is symbolic of blasphemy of the Holy Spirit not being forgiven.
Not being able to stop is symbolic of how hard it is to stop blaspheming the Holy Spirit.
This doesn't mean that smokers blaspheme the Holy Spirit, often times the earthly symbolism is manifested in an opposite community. It's an instructional example.
Either way, it's still a transgression, and I still smoke.