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"I would say the risks are going to be less with that form of consumption," says Rebecca Haffajee, a University of Michigan health policy professor who co-wrote a 2017 piece calling for recreational marijuana programs to allow only non-smokable forms of the drug

Even scarier is what we dont yet know: the unknown chemicals in the liquid and in the metal devices used to heat and vaporize it

Only safe, lawful practices are encouraged

From the 1970s onwards, the view was growing among some tobacco researchers and clinicians that nicotine and nicotine addiction were not, in fact, directly responsible for the death and disease caused by smoking