I remember back in my younger days I smoked 2 packs of Benson and Hedges in one day, put me off them for life [B&H that is, not cigarettes].
I don't want to call you a lightweight but I smoked AT least two packs of Basics in college most days (and also at night, apparently, I used to sit up bolt upright in the middle of the night, and smoke one, efficiently and safely, before going "Aahhh") and then returning to sleep.
While I don't "adore" the "heavy metals taste" of Basics, I'm pretty sure I could smoke one even today, without complaint.
I could be wrong, but I get stressed out enough I'd be up for a Basic. I smoked the English version of B&H but the US version is pretty much made up of the flosam and jetsam of the tobacco cutting room floor, I agree they're pretty terrible (potentially worse than basics.)
Anna