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Nail Tests : Similar to hair tests, nail tests can provide a long-term view of nicotine exposure but are less commonly used

Arch Gen Psychiatry 43 : 289294

[27] Market share [edit source] From its inception until 1978, Virginia Slims saw a steady increase in market share to 1.75% (3.9% of all female smokers) [22] [28] Markets [edit source] Virginia Slims are mainly sold in the United States, but also were or still are sold in the Brazil, Argentina, Germany, France, Switzerland, Portugal, Poland, Hungary, Cyprus, Belarus, Ukraine, Russia, Kazakhstan, Philippines, Singapore, Hong Kong, South Korea, Japan

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The first patent for an electronic cigarette was granted to Joseph Robinson in 1930