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Expert Q&A Tips Have fun with it

Calculating pack-years for loose tobacco or self-rolled cigarettes can be a little trickier as they are not standardised

First up, cigarettes kill Philip Morris, the world's largest international tobacco company, came under fire in 1999, when the US government brought a lawsuit claiming that leading cigarette makers were conspiring to lie about the dangers of cigarettes for decades

Which method matters depends on the question Use nicotine content (Method 1) if you're tracking total exposure over the life of a device, comparing products, or stepping down strength as part of a quit plan