Immigrant smuggling, or drug smuggling?

Now I agree that immigration should be strongly controlled. But who wants to bet that if drugs were legalized, this tunnel would never have existed in the first place, nor the cartels, nor the smuggling?

http://www.signonsandiego.com/news/mexico/tijuana/20060127-9999-1n27tunnel.html

In the corner of a cavernous Otay Mesa warehouse, a small room held a big secret: the door to a passageway from Mexico.
U.S. agents had been investigating the possibility of an elaborate drug-smuggling tunnel between Tijuana and San Diego for more than a year, but couldn't find it despite using military equipment so advanced it's classified.