I've worked with recovering cokeheads over the years. It's an insidious, dangerous drug, especially if abused over long periods of time. It's insanely addictive and expensive, turning successful people into paupers in a matter of months. It can blow your overworked heart out like a worn-out tire, wreak havoc with sensitive nasal passages and sinuses. Worse, it can deplete your body's finite reserve of pleasure-causing chemicals to the point you become dead inside, incapable of feeling emotions like joy or delight or even simple gratification. The filler dealers cut it with can be dangerous on their own, depending on what the dealers are using.
So yeah, if Warski's back on that poison then his life will only go in one direction. Given what's known of the man, he'll probably take it all the way. It's a sad, bad way to go.