is tobacco considered substance use FDA Education & Prevention Resources: Posters, Flyers, & More Dollars, Sense, and No Handcuffs:

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The biased uncertainty of each measurement method was based on previous studies, specifically 3% uncertainty in particle mobility diameter by DMA classification 68 , 4.7% uncertainty in particle aerodynamic diameter by AAC classification 69 , 2.8% uncertainty in particle mass by CPMA classification 70 and 10% uncertainty in particle concentration using a CPC 71

[8] Minghella graduated after three years and stayed on to pursue a PhD

My worst habit used to be smoking but I quit

When sold as air purifiers to be used in indoor occupied spaces, they are marketed to be safe and effective (though these claims are generally false)