Even marijuana often had little hitchikers that could trash your stash if you didn't deal with them (have them spend the night in the freezer!). I even used to find an occasional pack of smokes with little creepy crawlies in it, right after I broke the seal! Lately though, tobacco products appear to be too lethal for the cooties.

I doubt if fruit fly larvae could survive in canned fruit, even improperly canned fruit. Even if they did, they would have had to leave the pupal stage and flown away between the time the can was opened and when it was rinsed and recycled. Highly unlikely.

We all consume things that were once alive, that come from real ecosystems (even if highly modified ones); the food chain is not as pristine as the packaging and marketers have led us to believe. Fisherman can tell you even healthy game fish are crawling with parasites (if you know what to look for) and those are just the ones you don't need a microscope to see. In fact, it's amazing how few of the passengers we ingest unwittingly are actually hazardous.

Life is tenacious, did you know that wildlife photographers working in the tropics are plagued by molds and fungi that thrive on the glues that are used to cement multi-element camera lenses together, and on anti- reflection coatings on some of those glass-to-air lens surfaces?