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Oil and chemical executives have sounded similar themes for decades

"You can't undo the damage that has already been done, but you can avoid causing further damage," Chang said

Zig-Zag has perfected the rolling paper, earning a stellar reputation among both novices and seasoned smokers in Pittsburgh, PA

Since smoking is still the most common form of cannabis use both joints and blunts rather than say, an edible, it may make it easier to progress from cannabis smoking to cigarette smoking, Ling told HuffPost

The denominator is the difference between the smokers and nonsmokers reference lung cancer death rates