In a Coding Clinic example regarding a pediatric patient that was wheezing after exposure to e-cigarettes, the advice was to report the codes for wheezing and Z77.29, Contact with and (suspected) exposure to other hazardous substances . I do think that an adverse effect due to inhalation of vapors might be considered also.
Agree as well, Code J68.9 seems to cover the whole aspect of whats going on. Wouldn't use a T code in my opinion.