Used to live on eph so I know what can happen if you use it too long, but thats quite a while usually. Back in the day I practically lived on it, it messed my adrenals up somewhat, and took a bit to get back to normal. But its was sooo cheap and readily avail.
IMO, I don't use asprin, as I really think the negative things it does to a body outweigh the benefits. Caffeine- I love. I'm a coffee lover so I'm biased on it.
Also, when they're talking about clen being harsher, its your endocrine system we're talking about here. Clen hits the beta 2's of your thyroid much harder then eph.