Smoking an entire blunt is roughly the equivalent of smoking six joints. Cigars and their wrappers are highly toxic. Even if you remove the tobacco, high concentrations of cancer-causing nitrosamines and other toxins created during the fermentation process may remain.

5 joints at half a gram would add up to your full 2.5 grams. For the average consumer, or for a group of consumers, a typical joint or blunt would be around a gram, giving you 2 joints, give or take. Most prerolled options in dispensaries weigh out to a half gram or gram of cannabis.

Researchers estimated that the average joint contains 0.32 grams (0.01 ounces) of marijuana. That’s lower than some previous estimates; for example, a 2014 report from the White House on America’s drug use estimated that the average joint has about 0.43 g (0.02 ounces) of marijuana.

Smoking marijuana is far more dangerous than smoking cigarettes, according to a group of scientists in New Zealand. The researchers found that smoking one joint is equivalent to 20 cigarettes in terms of lung cancer.

Following very high doses of oral THC—the equivalent of smoking between five and 10 joints of average potency per day for 10 to 20 days—withdrawal symptoms also included runny nose, sweating, and decreased appetite, but lasted only four days.

A study in the January 24 issue of The BMJ found that smoking even one cigarette a day carries significant health consequences, namely a higher risk of heart attack and stroke.

Even if it was only once a month, they lit up. “What happens is when you first get addicted, one cigarette a month or one cigarette a week is enough to keep your addiction satisfied,” says Difranza. “But as time goes by, you have to smoke cigarettes more and more frequently.

“Smoking only about one cigarette per day carries a risk of developing coronary heart disease and stroke much greater than expected: around half that for people who smoke 20 per day,” the researchers wrote in the conclusion. “No safe level of smoking exists for cardiovascular disease.”

Smoking one or two daily carries large risk They found that compared with never smoking, smoking about one cigarette per day carries 40–50 percent of the risk for coronary heart disease and stroke that is associated with smoking 20 per day.

Background: Heavy smokers (those who smoke greater than or equal to 25 or more cigarettes a day) are a subgroup who place themselves and others at risk for harmful health consequences and also are those least likely to achieve cessation.