You guys ever hang out with someone with emphysema? Eek! That feeling that your suffocating, drowning if you will, that's their entire waking existence. Looks like hell on earth.
And cirrhosis if the liver? It's super painful. And, related kidney failure. Yikes! Spending your days headed to the dialysis clinic to get tubes shoved into you...eff me, that sounds horrifying.
Addictions are progressive, guys. They get worse, they don't stay the same...that's what a "tolerance" really is. Evidence of the progression of the disease.