Just think of someone who is new to Crack & they bang up 0.2 I.V. when they are new to it, that is a direct path to Hell as it's so much smoother & a far more " VERY yummy, I want more of that" & they will have no veins left after 12 months.
Crack dissolves in acetone. They'd have to introduce an acid to get it back to salt form. Them convert to hard again. Not an easy process for a newbie.
You can take the crack and put in a spoon with water and slowly heat it. It will turn back into an oil. Then sprinkle the smallest bit of fresh baking soda and see if there is a reaction (sizzle). If there is sprinkle a tiny bit more until it stops. Then Just cook slowly until it is a clear blob. Let cool and then smoke.