smoking cannabis vs cigarettes Snuff: USA Snuff (tobacco) - Wikipedia

Three studies, published in 2013, 2015, 2019 all estimated a national, upper-bound limit for smuggling (or tax evasion and avoidance or non-compliance) at 21%.[69] Much of the related literature employs empirical models of representative consumer demand, including such variables as cigarette price, tourism, income, race, religious affiliation and other demographic variables, in addition to the primary variables of interest: tax (or price) differentials

So will smoking before a blood test affect results

I think that the outcome was fine, the picture of Hurd smoking is still in the book, but I kind of think that the editor should have had a small punishment for editing a dead mans photo without his family's consent

That's not an exaggeration

You will be surprised to see the difference it makes