But vaping has its own problems: Nicotine or THC, the high-inducing chemical in marijuana, is mixed with solvents that dissolve and deliver the drugs. The solvents, or oils, heat up during aerosolization to become vapor. But some oil droplets may be left over as the liquid cools back down, and inhaling those drops may cause breathing problems and lung inflammation.
Links
[1] https://www.nytimes.com/2019/08/31/health/vaping-marijuana-ecigarettes-sickness.html