For those who smoke marijuana, the primary benefit is typically a little bit of relaxation. But a new study has shown that even moderate use of the drug doesn’t come without its ill effects.

A new study has found that marijuana actually increases the risk of having a heart attack within the first hour of smoking. After lighting up, a marijuana smoker’s risk for a heart attack jumps to five times that of a non-smoker.

This increase in risk is similar to forms of strenuous exercise and decreases over time. Two hours after smoking, a person’s risk is back on par with people who don’t use marijuana.

About 4,000 men and women between the ages 20 and 92 who had suffered heart attacks were interviewed as part of the study to see what activities were most likely to happen right before a heart attack.

Of these subjects, 124 reported having smoked marijuana in the year before the heart attack. Although marijuana use only posed the same risk as sexual activity, the researchers say the risk of smoking could be higher because the study did not include those who may have smoked, had a heart attack and died.

Scientists believe smoking strains the heart, but it’s unclear if that strain comes from the actual smoke or THC, which is what makes people feel high after using marijuana.

However, the heart attack risk related to marijuana use was nowhere near the threat of other drugs, such as cocaine. Cocaine use led to a 25-fold increase in heart attack risk.

Marijuana advocates argue that the study’s findings are incomplete.

But researchers say marijuana use can affect people in different ways, and people who only use the drug occasionally have reported other unsavory effects, such as anxiety and paranoia.

If you are looking for ways to blow off steam healthfully, exercise and hobbies have all been shown to have relaxing effects on the body.