They may be stoned but they sure tweet a lot.

Pot smokers and their followers appear to be more active in the microblogging site Twitter than those who are against rolling a joint, research into pot-related hashtags shows.

The recent study included more than seven-and-a-half million tweets about cannabis in a four-week period and researchers found 15 pro-marijuana tweets for every anti-pot post on Twitter.

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Results showed people 25-years-old and younger usually sent and received most of the tweets, especially teenagers who are in danger of developing lifelong dependence on weed and other substances.

The lead researcher, a psychiatry assistant professor at Washington University in St. Louis -- Patricia Cavazos-Rehg -- said the younger they start using pot, the more likely they become dependent. She said there is no science yet that can determine who will phase out marijuana use, as they get older.

Tweeters of pro-weed posts had a combined 50 million followers - a dozen times more than accounts with sentiments against marijuana, the research showed.

Many of the sympathetic tweets endorse pot legalization and staked claims about its medical benefits. Tweeters who said they were stoned at the time or using pot sent about 10 percent of the pro-weed tweets.

Cavazos-Rehg said it is highly likely that social media posts change people's attitude toward marijuana. Some of the tweets cited in the study are: "Boys that share their weed are the boys who get laid" and "Gonna smoke me some pot today.........i deserve it."

Researchers tracked hashtag use using Simply Measured, a social media analytics group, which kept tabs on every post about pot from February 5 to March 5, 2014. The search tool kept track of terms such as "stoner," "weed," "joint," "bong" and "blunt."

The study leader warned that although there is no proven link yet between pro-weed tweets to use of the drug, parents and regulators should pay attention because young people receiving the tweets are most likely easily influenced into experimenting with drugs and possible substance use.