A crackhead will break into your house and steal everything and if you get in his way he will shove a knife up your ass.

A tweaker will break into your house and steal everything and then take a crap on your carpet.

Crackheads = guys that use crack and are more violent

Tweeker usually refers to methheads and from what I've seen they are more pathetic then violent.

But there all tweekers and really need to have a chain and pad lock put around there leg and be hitched to a bumper until they come clean and quit messing up OTHER peoples lives.
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A.K.A
Lead Thrower