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A proper puff profile shows an initial dip in pH, then a rise in pH during the puff duration

doi: 10.1186/s13006-015-0046-5

How does such a petite device deliver a staggering 2000 puffs

Grimm, J

But, according to Wikipedia , which had a pretty detailed entry about tobacco advertising and car racing, tobacco was all but out of North American motorsport by 2013. Tobacco advertising died out for two reasons the 1998 Master Settlement Agreement forbid certain kinds of tobacco advertising (this apparently mostly affected IndyCar racing), and a number of countries around the world started forbidding tobacco advertising on cars