[DontchaKnowit]

Eh I dont buy it. I know people who smoke daily and eat healthy and excercise often. And vice versa. Is it all that surprising that a drug that spikes your heartrate and blood pressure every time you use it might do damage to your heart if you use it regularly? Seems pretty intuitive to me.

[meiraleal]

It seems pretty intuitive to me that it could also make your system stronger? Many mechanisms in the body work like that

[inglor_cz]

These are just fairly nonspecific symptoms, much like fever. The underlying mechanism matters.

You can get your heart racing by exercise and you can get your heart racing by drinking ten coffees in a row. I don't think the resulting changes in the organism will be precisely the same, otherwise people would just drink loads of coffee to get fit.

More likely, the observed effects like increased blood pressure are just downstream from some deeper metabolic events, and it is those deeper events that are decisive for your future health.