Long story short, there is no real way to deal with chem fascination/interest. Like pyromania and diseases, it's little more than a timed "fuck you" button that gets pressed every now and then and you have to deal with it. Beating your own pawns senseless or walling them in isn't really a solution, the damage done to your colony with these methods are about as large as the binges themselves cause. The best thing to do is avoid the trait in your starting group and turn down any junkies unless you're desperate for fresh bodies.
If you somehow end up with one anyway, I suggest you turn them into a drugged up super mercenary. Get them hooked on Go-Juice and Yayo, give them a good weapon and maybe some bionics and put them on the front line. The problem will then sort itself out eventually.
If you somehow end up with one anyway, I suggest you turn them into a drugged up super mercenary. Get them hooked on Go-Juice and Yayo, give them a good weapon and maybe some bionics and put them on the front line. The problem will then sort itself out eventually.