There is nothing saying you cant take your tren too. Moderate dosage, id say =<300 mgs/wk.
The stims help deliver oxygen by means of the elevation in heartrate and dilation of airways, which in turn can counteract some of “I get winded tying my shoes on tren” type stuff. Hooray sympathetic nervous system!
However the caveat is and always will be how hard you are making your heart continuously work. There is nothing intrinsically wrong with having your heart work hard, the problem is that the heart never gets to stop and only has so many beats in it. There is the risk of cardiac hypertrophy which is much more pronounced when using AAS as well, bigger heart, the harder it must continuously work and it sure is shit isnt about to atrophy once it grows.
The harder your heart pumps the stronger it is and the more blood it delivers (stroke volume being equal), but much like a sprinter vs a long distance runner, which do you think is better for longevity: a strong muscular heart or a high endurance efficient heart? So long as you understand you are taking years off your life for the sake of the rush go nuts. I’ve said a million times that the star that burns twice as bright burns half as long, and I believe we live for and feel the most alive within those moments when our hearts race. Just be careful.