My guy with a destroyed stomach and 10% alimentation efficiency is smoking slower, not really a bug I guess but it should be more dependent of lungs and respiration efficiency.
I would suggest that anybody that looks into this also check a couple other drugs for similar issues.
-Flake is inhaled; may be subject to the same issue as in OP's report.
-Yayo is snorted; rate of snorting should not be directly affected by digestion.
Fixed in A17. Thanks for the report!