federal law defines roll-your-own tobacco as tobacco that, because of its appearance, type, packaging, or labeling, is suitable for use and likely to be offered to, or purchased by, consumers as tobacco for making cigarettes
Measuring chemical exposure To find out how harmful the two types of cigarettes really are, the researchers calculated the levels of two groups of cancer-causing chemicals found in tobacco smoke (polycyclic aromatic hydrocarbons (PAH) and tobacco-specific N-nitrosamines (TSNA)) inside the bodies of smokers
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They each took part in four sessions, smoking joints that included: cannabis and tobacco, cannabis and a placebo, tobacco and a placebo, or just the placebo of both