I don't think she goes nearly far enough.
Doug Sellman has already warned us that muesli bars, ice cream, cakes, chocolate, donuts, jam, honey, pies and pastries, and other foods are addictive. So we need warning labels for all of them too. Those labels can go beside the cancer labels.
A bottle of Jack Daniels should come with a warning label that, if you drink too much of it at once, the trunk of a big old live oak tree might hit you in the face and that the bright sunlight might hurt you in the morning.
Any food that could lead to obesity, if you ate 3000 calories per day of it, should also get a warning sticker.
We can also have warning labels for any food that isn't organic, specifying exactly which chemicals were used on which ingredients at any point in the process. Just having something labeled organic is hardly enough when "not organic" can have a very wide range of scary chemicals. Maybe I don't mind glycosphate but maybe malathion scares the heck out of me. You'd have to be meddlesome and paternalistic to think I shouldn't get my sticker just because your science tells you that levels of chemical residue allowed under current regulations are basically harmless. Who are you to tell me what to be scared of?
I won't be happy until every package is so covered with warning stickers that you can barely tell what the brand or product is. Because seeing brands is bad too.
I also worry that, with growing evidence that obesity could be contagious via gut microbes, we might need warning stickers on obese people warning against sharing saliva with them. Mandatory "Warning: don't kiss me. Obesity may be contagious" t-shirts should do it. I also can't believe how people with STDs are allowed to walk around without warning tattoos on their foreheads.
And don't get me started on the inadequacy of road safety signs. Where's the warning sign about Homer's warning sign? Warning signs all the way down.
More seriously: here's the one warning label I'd like to see on alcohol. A simplified version of the J-curve relationship between alcohol consumption and all-source mortality from DiCastelnuovo et al, below. Drinking too little and drinking too much is risky.