A new study published in Tobacco Induced Diseases finds that cannabis use—both vaping and smoking—has increased over time, with more young adults initiating use than quitting, and high levels of co-use with nicotine and tobacco products. Researchers from Columbia University Mailman School of Public Health report that simultaneous cannabis and e-cigarette use is especially common among young adults who vape nicotine, with similar rates observed across genders. The findings highlight that cannabis consumption is not only growing but increasingly intertwined with nicotine use.
Analyzing data from the VapeScan longitudinal study of 372 adults in the New York City area between 2021 and 2024, researchers found cannabis users often consume multiple product types, including vapes, edibles, smoked products, CBD, and topicals. By the second year of follow-up, nearly 60% of participants reported cannabis use, with cannabis vaping and smoking both rising. Notably, 21% of participants were new cannabis vape or smoke users over the study period, while only 6% of earlier users quit, underscoring a net increase in use.
The authors say the expanding variety of cannabis products, rising frequency of use, and widespread cannabis–nicotine co-use pose growing public health and regulatory challenges.
