Sherlock The Sign Of Four Summary

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When I began to read The Sign of Four I was surprised that Sherlock had a cocaine addiction. I didn't think that someone as smart as him would even think to use drugs because they would alter his brain. However, after reading his reasoning for using it I understood what he meant and think that, for him, it's a plausible cause for him to use cocaine. I think that it completely makes sense that when he isn't trying to figure out a case that he can't handle not having anything to do with his brain. The fact that he is so smart and loves a challenge means that when he has nothing stimulating his brain then he feels like the world is too boring for him. Sherlock explains that when he uses cocaine, then his brain is active to the point where