vaporisers for medical purposes; handheld vaporisers for medical purposes; vaporisers for vaporising constituents of herbal matter for medical purposes; gas powered hand held vaporisers for vaporising constituents of herbal matter for medical purposes; electrically powered handheld vaporisers for vaporising constituents of herbal matter for medical purposes; pouches for herbal matter for use in vaporisers; pouches partly or wholly of permeable membrane material for herbal matter for use in va...