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International Journal of Preventive Medicine
Relationship between clinical efficacy and clozapine concentrations in plasma in schizophrenia: effect of smoking

[18] The vapor have been found to contain propylene glycol, glycerin, nicotine, flavors, small amounts of toxicants, [18] and heavy metals, as well as metal nanoparticles, and other substances

& Vatten, L

I would say 21 is probably the best. The same went for smoking, she said
