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Tests may be either qualitative (providing a yes/no result based on a set threshold) or quantitative (providing the exact level of cotinine to estimate usage)
Some studies suggest regular cannabis use in adolescence can negatively impact memory, learning and impulse control
On average, the research team found that smoking a pack of cigarettes a day led to 150 mutations in each lung cell every year, and the mutations represent individual potential start points for a cascade of genetic damage that can eventually lead to cancer
READ: Yeah, no, I think it's all kind of part, it's really hard to untangle a bunch of these different threads
The cross-sectional design of the study may represent a limitation since reverse causation cannot be excluded
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