Cocaine vs. meth effects questions

[.:Holy::Toast:.]

This is kinda two questions but they deal with the same two drugs so I just made one thread

1. When people mention that cocaine and methamphetamine put stress on your cardiovascular system from increased heart rate and vasoconstriction, it makes sense obviously as they're stimulants, but why does this cause excess stress on your cardio vascular system? Would it not be equivalent to moderate exercise which can strengthen your heart. I think this is because I assume exercise causes vasodilation when your body heats up allowing more blood to flow from your core, but I'm not sure.
I know people with cardiovascular problems can be killed from lower doses of stimulants, but would moderate exercise do the same? Or are there other factors at play attributing to the stress. Heart rate and vaso constriction seem like very black and white answers to this subject

2. This next question would assume were dealing with pure cocaine and pure methamphetamine, so which one would cause more cardiovascular stress? I'm assuming cocaine because in relation to meth it's OD point is much lower than meth, as well it seems most injuries from mixing stimulants tend to have cocaine as the stimulant used in the combo (although in these scenarios purity and adulterants can't be so easily removed from the equation.
And again, what might be the reasons for this, or are my assumptions even correct?

 

[Intenselife]

Lol i saw nowone else responded so i thought i would chime in on my say. Cocaine/meth puts stress on cardivascular system in a different way than excercise does (obviously in a more negative way). And for which is worse for cardiovascular stress out of pure cocaine, pure meth that is hard to answer for anyone since very few of us have had legit pure cocaine/ or meth.

But i would say a low dose of cocaine is better, but i could be wrong. In our country majority of the cocaine is shit, even the cocaine is that is considered high quality usually is just average, and it's not just my opinion if you research it you will see. People in columbia in 90's were ODing off lower doses of cocaine, while here i have seen people do line after line. Cocaine overdose in the united states is a lot less common considering how weak the cocaine USUALLY is.

Good/almost pure cocaine can be very easy to overdose on, simple as one line for a non tolerant could do it.