Marijuana labs — sometimes called hash oil labs or BHO labs — were exploding before legalization, but the problem grew bigger after marijuana possession became legal in July 2015.  The number of burn victims rose from 7 to 30 within a year.  Today marijuana users can buy“wax” or “dabs” from licensed dispensaries, but it is cheaper to make at home using butane.   Unlicensed chemists who run the marijuana labs may be trying to sell their own supply to undercut the legal market. Or they be so addicted that risking death is not enough to stop them.