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Also, the results haven't been replicated by other researchers

Additionally, the low R 2 (11.3%) suggests residual confounding by unmeasured variables

This means that you can gradually decrease the amount of nicotine in your system, helping you to beat those pesky cravings

After a few other jobs, I ended up working on a farm in MA for 38 years

See Bloem, Good Intentions Gone Bad?
Tar, on the other hand, is a byproduct of burning tobacco, producing a thick, sticky substance that settles on your walls and allows the nicotine to stick