I'm not sure in which degree recent Covid vaccines contribute to it (if at all), but here is a 2019 article about an increase in heart attacks among young adults:
...these events are steadily rising in very young adults. New data not only validate this trend but also reveal that more heart attacks are striking those under age 40...
The study, which is the first to compare young (41-50 years old) to very young (40 or younger) heart attack survivors, found that among patients who suffer a heart attack at a young age overall, 1 in 5 is 40 or younger. Moreover, during the 16-year study period (2000 to 2016), the proportion of very young people having a heart attack has been increasing, rising by 2 percent each year for the last 10 years.
"It used to be incredibly rare to see anyone under age 40 come in with a heart attack—and some of these people are now in their 20s and early 30s," said Ron Blankstein, MD, a preventive cardiologist at Brigham and Women's Hospital, associate professor at Harvard Medical School in Boston and the study's senior author.
Besides "traditional" risk factors such as diabetes and high cholesterol, younger patients also reported drug abuse:
However, the youngest patients were more likely to report substance abuse, including marijuana and cocaine (17.9 percent vs. 9.3 percent, respectively), but had less alcohol use.
So here you have it: smoking dope is not only degenerate, it will also give you a heart attack at the age of 25. While moderate alcohol use, on the other hand, does appear to be somewhat protective. Reject modernity, embrace tradition:)