2012, 7 (5): e36934-10.1371/journal.pone.0036934
They have not been researched thoroughly, but it is very likely that they are much less harmful than actual cigarettes because they do not produce the range of damaging chemicals found in tobacco smoke, although they are not entirely harmless
The Advice and Referral drop downs will only be active if you have coded the patient with a smoking code
The tobacco is smokable, Castelar joked, but were missing someone with the lungs for it. And maybe a blow torch to light it, too.
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