The issue here is which is better. Is seventy percent of something better than one hundred percent of nothing?

If you are not willing to take the big leap and abstain from the destructive behavior, then it's an obvious choice to try a harm reduction model.

Determining if it's the correct model for you sometimes takes time. Sometimes it takes a few relapses such as falling off the wagon, falling back, to determine whether small steps are ideal for you or larger steps, meaning complete abstinence or something short of that.