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Estimated probability (%) of using various methods of support during a quit attempt from 1998 to 2017, including (a) no support, (b) Asking a doctor for help or advice to quit by heaviness of smoking, (c) using a quit app or text messaging service by region, (d) NRT by socioeconomic disadvantage, (e) NRT by heaviness of smoking, (f) NRT by quit intentions,.
