Smoking cannabis dramatically increases a person’s risk of suffering a heart attack, according to a major new study.
Researchers in the United States found that, over a five-year period, regular users in their early 30s were 4.6 times more likely to have a cardiac-related illness than those who did not smoke the drug.
Users in their late 20s were three times more likely to have a heart attack.
From this study it seems that it is the lifestyle of those who smoke marijuana that increases the chance of a heart attack and cardiac-related illnesses, not the drug itself.
Hence:
“They noted that users tended to have higher blood pressure than non-users and were more likely to drink heavily, smoke tobacco and have type 2 diabetes – all of which raise the chance of a heart attack.”
No, that is not correct. The article specifically states that those factors were controlled for, which means the difference is not because of those factors. From what I can see it is not possible to say from this study whether the difference is an effect of cannabis itself or other confounding factors.