Angelique is right. It's not that simple.

They can cause damage to your whole circulatory system. It's not just a case of high BPM. I think the worst part is high blood pressure. I assure you there are consequences even if they might not seem apparent now.

For instance, they can cause structural damage to your heart, like you might end up with a faulty heart valve in 20 years time because of wear & tear of stimulant use.

It varies for all the stimulants but especially using relatively unknown RCs it's anybody's guess what the long term (or even short term!) effects will be.

Plus even though you say it doesn't increase your heart rate & you think you have some godly intolerance doesn't mean you couldn't overdose & end up with tachycardia or a dangerous arrhythmia or something. (I'm not doctor but I guess those are the likely candidates)

You think you are invincible but you are not. We all think so at that age but trust me, don't wait for something to go wrong before getting a wake up call... because it might be too late.

And we just lecture you because we care Tweakster.

PS - I'd imagine your prescribed ones at the correct dosages will have minimal impact, it's just all this stuff on top of it. You could be fine in the long run... but is it a risk worth taking?