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One potentially serious drug interaction with cannabis is an increased risk of bleeding in people also taking the anticoagulant (blood thinner) warfarin

Color 22 Years Tanner

We then estimated the independent association between childhood smoking and GPH and GMH separately using multivariable weighted gamma-distributed GLMs, adjusting for covariates (all covariates are listed in the table) as described above

This release of dopamine is similar to that seen with drugs such as heroin and cocaine and is thought to bring about the satisfying sensations experienced by many smokers

But, as the authors of the study conclude, this was "a modest experiment undertaken with no budget and a group of volunteers in the space of one week", yet it suggests that one of the main arguments often presented against plain packaging is likely to be incorrect