Get marijuana that isnt so harsh and if my lungs are tender from ciggs I smoke joints only they tend to be less harsh then pipes or bongs.
My gd bong and hooka choke me the furk out.

There really is no safe way to smoke weed it all has its own risks but the least harshest way (joints) should be ok for you.

If your weed is bad harsh peel a apple take some of the peelings and place them in your bag of weed seal the top of the baggie(zip-locks are the best)
leave some air in it shake it up and let it set over night maybe even 2days.
I dont know why but the peelings draw out whatever makes weed harsh or atleast some of it.

Hope that helps