How has tobacco use changed over the last few decades? it has doubled about every ten years
it has not been closely tracked
it has increased steadily for decades
it has significantly decreased

D

Explanation:

Between 1965 and 2011, adult prevalence of cigarette smoking fell from 51.9% to 21.6% among men and from 33.9 to 16.5% among women, with an increasing fraction of smokers who do not smoke every day. Federal taxes have increased from $0.08 in 1965 to $1.01, with even larger increases in many state taxes.

Hopefully this helped! :D

-LavenderVye