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doi:10.1136/tobaccocontrol-2013-051476

Investigations into the cellular composition of bronchoalveolar lavage (BAL) fluid in cannabis smokers revealed significantly elevated total cell counts, particularly neutrophils, in the BAL fluid of both marijuana-only and combined marijuana-tobacco smokers compared with non-smokers (49)

were discreet and reported hiding their usual pack in public settings," said senior author David Strong, professor at the Herbert Wertheim School of Public Health

Two Examples of pack year calculations Examples of people calculating their smoker pack year number

But Robert Kaestner, a professor of public policy and economics at UC Riverside, said research hes done doesnt bear that out