Well from what I can see, your facts about clenbutoral are not straight, so There is no point in making a decision toward using a drug in the same class as clen, untill you have all the facts right.
Bottom line however, without wasting my time is to tell you stimulents all are associated with the same risks. There is no magic stimulent out there that is going to burn fat, without the associated cardiac risks.
Just knowing that clen is such a harmful drug that your body actually downregulates/ destroys its beta receptors to alieve itself of its affects should tell you something.
These drugs should only be used as a last resort, a way of dropping that extra percentage of fat when you are contest dieting, under very carefull use, and for short durations. They are just the icing on the cake of the incredibly hard work.
They are not a magic pill. Unfortunately there are so many lazy punks out there that lack the self control to be able to diet adequately enough to actually shed bodyfat, that they feel they need to use these drugs to achieve there plans. Fact is they never do, and they just end up fatter, and with cardic damage after they go off the drug.
And don't even get me started about 17 year old adolecent boys using steroids - trying to be men before their time.