They don't skip over this; it just isn't called out in the summary:
"One area where legal marijuana has reaped unexpectedly large benefits is state tax revenue. Colorado, Washington, and Oregon all impose significant excise taxes on recreational marijuana, along with standard state sales taxes, other local taxes, and licensing fees. As seen in Figure 25, Colorado collects well over $10 million per month from recreational marijuana alone.91 In 2015 the state generated a total of $135 million in recreational marijuana revenue, $35 million of which was earmarked for school construction projects. These figures are above some pre-legalization forecasts, although revenue growth was disappointingly sluggish during the first few months of sales.92 A similar story has unfolded in Washington, as illustrated in Figure 26, where recreational marijuana generated approximately $70 million in tax revenue in the first year of sales93—double the original revenue forecast.94 Oregon only began taxing recreational marijuana in January 2016, so data are still preliminary; however, state officials report revenues of $14.9 million so far, well above the initial estimate of $2.0 million to $3.0 million for the entire calendar year95 The tax revenues in these states may decline."