The free will argument demonstrates that christians don't understand free will.

[Neo-Scholastic]

Heaven simply is not the huge problem that you guys make it out to be. Let’s start with my earlier statement. Your nature does not determine your choices; but rather, your choices define your nature. The more choices you make the more fixed your nature becomes, for good or ill. Anyone can see that long-standing habits are harder to break than the first few tries. For example, people can quit smoking and never return to the habit, but long-time smokers find it more difficult than those who just started. By the time you reach the afterlife, your habits have gained enough momentum that you can continue becoming more of what you already are unto eternity.

This has nothing to do with the nature of free will. If something has already taken a long time to happen, then it has a lower probability of happening any time soon. The longer it takes to draw a red marble from a bag, the fewer red marbles there will be in that bag. The longer it takes to scare a criminal, the less fearful he must be. The longer it takes an abuser to feel guilt, the less capable of guilt they are. etc.

Smoking addiction is a particularly bad example because it has a biological basis.

Are you equating human behavior with chance outcomes? Seems like apples and oranges to me.