If the cans weren't lined (like other commenters remarked), the most the acid in the soda would do is dissolve a little bit of the aluminium - of course that's

If the cans weren't lined (like other commenters remarked), the most the acid in the soda would do is dissolve a little bit of the aluminium - of course that's not necessarily healthy, but to get a hole in the can you'd need something much stronger. Despite what some urban legends claim, there is still a difference between Coca-Cola and hydrochloric acid...