Now we're cookin' with gas! er...without gas.

I think a binary system leaves no room for nuance, and therefore, no ability for consumers to make informed decisions. What about a scale instead? 1 could mean “Cancerous? Technically, but don’t worry about it unless you’re mainlining it 23 hours a day, dude.” And 10 could mean, “Seriously, make sure your will is updated.”