Some people are just destined to become addicted to something. Anyone who's ever been drunk has an idea of the level of dedication and the massive amount of work that would be involved in becoming an alcoholic. Being drunk constantly is far too much work for most people and becoming a coke addict is exponentially more expensive and less convenient than being a drunk. Every 15 minutes snorting or every 5 minutes smoking cocaine just isn't something most people would ever attempt to do for stretches longer than an evening.