You mean like caffeine or nicotine?
1) Addictive as in, one "normal" dose causes high physical addiction.
2) Lethal, more specifically that it is easy to overdose, or that the difference between "normal" and LD50 is low.
You don't get hooked on caffeine after one coke, and it's hard to kill yourself drinking too much coffee.
The ones who can't handle their addictions will cease to be a problem soon enough.
Less importantly, but still relevant, it also doesn't cause anywhere near the level of constipation that pharmaceutical opioid drugs cause.
It also activates both mu and delta opioid receptors, which is perhaps why I personally find it is so much more effective for neuropathic pain than the more common mu-opiod pharmaceutical drugs.
[1] http://pubs.acs.org/doi/abs/10.1021/jacs.6b00360?journalCode...
Let Pepsi, Toyota and Apple prove they're better than Coke, Ford and Microsoft!