| http://www.w3.org/ns/prov#value | - ???Personal vaporizers are electronic devices, the functional elements of which are integrated into a stainless steel shell, and include a small plastic cartridge that contains an absorbent material moistened with a propylene-glycol liquid solution,??? Frija says. ???That solution may or may not contain nicotine, tobacco flavoring or other flavor essences, an electronic airflow sensor, a heating e
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