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Robin Thicke is giving fans an idea of just how much it costs to write a song like "Blurred Lines." 

In an interview with "The Sun," the singer said that he's spent "a good $500,000 dollars on pot," the drug he calls his "crutch," his "muse" and "the lesser of all evil." 

Robin continued detailing his personal use, saying that he has a friend who runs a medical marijuana store and it's "a non-stop chimney" in his home.  He did however say that he has tried to quit using it, adding that he's "quit everything once."  

Thicke's single is currently enjoying its seventh consecutive week at the top of the Billboard Hot 100, and his latest album  is looking at a solid debut sales week as well. 

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