tobacco prevention and cessation journal & – ScienceOpen PDF) The 40-day cytisine treatment
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If the dose (exposure) is large enough, any chemical, even water, can cause toxicity

Some jurisdictions allow opt-out only in limited areas, such as those related to competition law

The health consequences of involuntary exposure to tobacco smoke: A report of the US Surgeon General

Retrieved 17 April 2009

Yet, these machines are fallible and often do not flag mouth alcohol
