New 2015 study found that long term use of Clenbuterol leads to DNA damaging effects.

[jay94]

Mutagenicity and DNA-damaging potential of clenbuterol and its meta... - PubMed - NCBI

So, does this change everything?

[zempey]

Not for me, I don't use clen, but if I did I would certainly look into this more.

[Bonaparte]

All that study found is that if you soak some tissue in clen in a petri dish, tissue exposed to clen will experience a bit more DNA damage than a tissue sample just sitting there. Not too applicable to anything that matters.
I'd be much more concerned about the known side effects.

[lovbyts]

Note to self, dont take a bath in clen.

[Motardpdx]

More of this^^^