I discovered this method when I was levelling my characters smithing recently. I haven't seen it anywhere else so I thought I'd post it here.
Step 1: Get your smithing up to level 30 through any method and get the dwarven smithing perk
Step 2: If your not an orc you need to become blood kin. I did this by completing Ghorzas quest in Markarth as it adds 2 smithing levels itself
Step 3: Go to dushnikh yal
Step 4: Speak to Gharol and buy all of her dwarven metal ingots
Step 5: Get your gold back from her inventory chest (
http://youtu.be/Zi6joSM4qdg)
Step 6: Save the game, kill Gharol and load your save. Her inventory will restock.
Step 7: Repeat until you have loads of dwarven ingots
Step 8: Make a bunch of dwarven bows then improve them
End result: Using this method my smithing went from 30 to 80 in about 2 hours
I hope you like my method!