The ballot question to legalize small amounts of recreational marijuana in Massachusetts calls for a tax rate on pot sales that would be lower than several states that have previously legalized the drug.

Critics argue the proposed tax structure may not generate enough revenue to cover the regulatory costs associated with marijuana legalization.

Question 4 calls for a 3.75 percent excise tax on retail marijuana sales, on top of the state's regular 6.25 percent sales tax. Cities and towns could opt to assess an additional 2 percent tax.

Colorado currently imposes a 10 percent marijuana sales tax, a 15 percent excise tax and local sales taxes. Washington state has a 37 percent excise tax.

Ballot question supporters say the lower tax rate would be sufficient to fund regulation of recreational marijuana and turn consumers away from the black market. (Associated Press)

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