1. Transitions to regular smoking and to nicotine dependence in women using cannabis;Agrawal;Drug and Alcohol Dependence,2008
2. ‘You can’t go without a fag. You need it for your hash’—A qualitative exploration of smoking, cannabis and young people;Amos;Addiction,2004
3. Personality risk factors associated with trajectories of tobacco use;Brook;The American Journal on Addictions,2006
4. Centers for Disease Control and Prevention. (2017). Smoking and tobacco use: Health effects. Retrieved January 15, 2019, from Smoking and Tobacco Use website: http://www.cdc.gov/tobacco/basic_information/health_effects/.
5. Centers for Disease Control and Prevention. (2018). Health effects|Marijuana. Retrieved February 11, 2019, from https://www.cdc.gov/marijuana/health-effects.html.