No one has, and the biggest research project looking at the link between cancer and upper-respiratory-airway cancer and cannabis was done by a researcher named Donald Tashkin. It was funded by the National Institute on Drug Abuse in the U.S., and it found not only no link between cannabis use and upper-respiratory or lung cancer, but also that those who used cannabis moderately had a lesser chance of having upper-respiratory lung cancer than non-cannabis users, which is quite remarkable.
On May 13th, 2014. See this statement in context.