Marijuana affects the lung and digestive systems at nearly the same time regardless of how a person takes it. Marijuana’s effects on the digestion happen whether a person smokes or eats it.
If s/he smokes it, the effect on the lungs, heart and small vessels of the brain will be more pronounced and dramatic.
If s/he eats it, the effect on the digestion will be slightly more pronounced.
A person will have slightly less fire to deal with if s/he eats marijuana rather than smokes it, and the effects go to a deeper level of the body and mind. The quality of the high tends to be less impulsive, explosive and potentially dangerous in terms of sudden vascular effects when marijuana is consumed rather than smoked. The effects also come on much more slowly.