[zeestephen]

Re: "3.5X to 5X more likely to develop head and neck (HNC) cancer"

Unless we know the life time risk for head and neck cancers, 3.5 to 5 times risk is not a meaningful number.

Life time risk for colon and rectal cancer - much more common than HNC - is just 4%.

Most cases of HNC are linked exclusively to tobacco and alcohol.

[Does so]

“Most cases of HNC are linked exclusively to tobacco and alcohol.”
^

My late neighbor would attest to that.

Never ceasing tobacco and alcohol use, he underwent annual surgeries until he died.

However, he’d also consumed “weed” during his college years.

As for the four known “tokers” of my acquaintance, ALL have passed away...