damage from cigarettes 26 Health Effects of Smoking on Your Body Secondhand smoke damages lungs, MRIs

Retrieved 17 August 2013

A survey conducted by the American Journal of Public Health collected data from over five thousand teens in the U.S

For cross-sectional studies, we used the BIOCROSS risk of bias tool 10 when it involved assessment of the health effects by biomarkers

Co-use was relatively stable across the different periods. Writing in the journal of Addictive Behaviors, the researchers said that the evolving trends in use of the two substances could be evidence of a substitution effect amid changing harm perceptions, evolving legislation, and shifting norms. The rising cannabis-only use across groups parallels the expanding state-level recreational cannabis legalization, increasing accessibility and normalization, the paper says