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Toxicity is likely to vary depending on the type of liquid and device, as not all additives are the same and, in some products, nicotine is absorbed faster than in others, but it is not clear which products are the most dangerous

RELATED: Your Car Reeks Of Pot

Cannabis smoke contains prenylthiol a volatile sulfur compound which is detectable by humans at extremely low concentrations and is highly adhesive to textiles

Results plateau and may reverse if smoking continues

"If you take a puff at a party once a week, that's probably fairly low risk," says Dr

Those featuring the cowboy -- "an almost universal symbol of admired masculinity," as Leo Burnett wrote to Philip Morris's advertising director in a letter outlining the campaign -- drew the strongest response