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The message about smoking tobacco being bad for you has gotten out there, but for cannabis, its much less clear, said Alison Rustagi, MD, PhD, assistant professor at UCSF and first author of the paper

Similarly, tobacco products must be in plain packaging, with no branding, logos, or images except for graphic health warnings

Lighters contain butane, which can negatively affect your smoking experience

Evaluation of the genotoxic and cytotoxic potential of mainstream whole smoke and smoke condensate from a cigarette containing a novel carbon filter

We also see various other darker areas on the skeleton suggesting shadow