Some, but not all [1]: "... the remaining 17% reported using only nicotine-containing vaping products... It is believed that the non-THC/CBD vapers who were diagnosed with EVALI were actually suffering from disparate vaping-associated lung diseases caused by different toxins within the aerosols or different host responses to the inhalants."
Note that many of the toxic chemicals referred to in this paper are normal components of nicotine vape juice, including but not limited to the flavorings, so the comparison to spiking Tylenol with cyanide is not particularly apt.