Crack cocaine is known as one of the more dangerous forms of cocaine and can be found in rock formation. Crack cocaine is smoked, and is called crack because of the cracking sound it makes when being heated. While many of the signs of cocaine addiction can be somewhat obvious, crack cocaine addiction symptoms can be a little trickier to recognize. Since crack cocaine is smoked, the typical constant sniffling or nosebleeds that often occur in those snorting can’t be found.