Well, cardiovascular pharmacology is not my area of expertise, so I'm rather hesitant to conclude or spout information regarding something I have not extensively researched. That said, lets not let facts get in the way of a good opinion

Essentially, chronic use of beta-agonists (which ephedrine is -- both a direct and indirect actually), particularly those that cause increased activation of B1 in the heart, may exacerbate left ventricular hypertrophy (which we all are at risk for to begin with thanks to resistance training) and could precipitate premature heart failure decades from now. There are also B-adrenoceptor dependent and independent effects of ephedrine on cardiac electrophysiological signatures/traces, which could lead to arrhythmia risks in some people.
On top of this, as I said, chronic use of ephedrine and most other stimulants for that matter can and will have negative effects on one's endocrine profile, including increased stress/cortisol levels and decreased androgen production. Although such effects will vary widely between individual in both severity and susceptibility, largely because so many other factors can influence the situation, namely sleep/diet/environmental-stress/lifestyle/etc.. Caleb and others here have written and discussed the HPA and its dysregulation and dysfunction in response to chronic stimulants and stressors -- do a search and also look at old issues of Mind & Muscle.
Of course, ephedrine is still relatively quite safe and was largely undeserving of its demonization by the media/FDA/AMA. Its all about context and strategic use. I'm just very careful about things like this even if I probably shouldn't be. When I used it, I ended up cycling it something like one week ephedrine and one week HEAT and then one week of washout (nothing), always taken a half-dose (12-15mg) on an empty stomach, along with my pre-workout drink. I think it is best used on low-rep/strength focused days where increased heart rate is a relatively smaller issue, and longer rest periods are taken between sets. Adrenergic pressor supps/drugs are very useful indeed, just be wise about chronic use and doseage.