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- Beginning in the mid-2010s, newspapers started implementing paywalls on their websites as a way to increase revenue after years of decline in paid print...53 KB (6,212 words) - 10:44, 7 September 2021
- e‐cigarettes (on which users are least dependent). PDF version behind a paywall Citation: Jackson, S. E., Brown, J., and Jarvis, M. J. (2021) Dependence...51 KB (5,935 words) - 16:02, 3 November 2023