Chemicals, pesticides and intense concentrations are all things that may be in the liquid versions of marijuana that are ...

"The bags this vaporizer fills are a hit at any social event," writes Brandon Siddall, head budtender at top marijuana dispensary Caliva, and Adam Smith, purchasing manager in an email.

Marijuana sales could hit $20 billion by 2020, with help from the ever-growing vaporizer market. Vaping is an alternative to smoking that involves inhaling vapor from an electronic device.