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American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 314 (6), R834R847

When the user inhales, it activates the device

adults who answered yes to the question "Do you, yourself, smoke marijuana?" is consistent with the 11% to 13% range Gallup has found since 2015, but slightly higher than the 7% reporting this in 2013

Limitations In most countries, national level brand-specific price statistics were not available, thus the retail price data were collected from one supermarket/hypermarket or kiosk/newsagent/tobacconist/independent food store usually in the capital city of the country (where survey respondents were mostly located), therefore potentially not being nationally representative.