cigarette in a can TOP Superoll Tobacco Regular - 3.5 Oz Bugler Can 6oz- Original
Description
[9] In general, 30% COHb is considered severe carbon monoxide poisoning

But research takes time

Drug Alcohol Abuse 19, 263281 (1993)
This creates a stronger sensory overlap with dense cigarettes like Marlboro Red

I dont anticipate that will happen very frequently