As of January 1, 2020, the province of BC has increased the sales tax on vaping products from 7% to 20%. Vaping products include cartridges, batteries, e-liquid and other vaping accessories.
If you would like to know more about the PST change, here is a link to the notice on the BC government website: https://www2.gov.bc.ca/assets/gov/taxes/sales-taxes/publications/notice-2019-005-sellers-vapour-products-pst-rate-increase.pdf