A third of traditional cigarette smokers said they also used cannabis every day.
Young smokers were more than 50 times more likely to use cannabis daily than their nonsmoking peers, informs CNN.
Smoking cigarettes and daily use of cannabis are strongly linked in the United States, research says.
“More people are smoking cannabis on a daily basis,” said Renee Goodwin, the lead investigator and an adjunct associate professor at the Mailman School of Public Health at Columbia University.
Marijuana is the most commonly used drug, used by about 22.2 million Americans.
Generally, smoking and daily pot use were found to go hand-in-hand.
Daily cannabis use also increased among non-daily smokers (3% in 2002 compared with 8% in 2014) and daily smokers (5% in 2002 versus 9% in 2014) and even among former smokers (0.98% in 2002 versus 2.80% in 2014).