arithmetic-logic unit (ALU) An arithmetic-logic unit (ALU) is the part of a computer processor (CPU) that carries out arithmetic and logic operations on the operands in computer instruction words. In some processors, the ALU is divided into two units, an arithmetic unit (AU) and a logic unit (LU).
Can you donate blood if you smoke or have smoked marijuana? For those of you who did not come here to read a lengthy discussion of this topic, the answer is yes. It is perfectly fine for someone who has smoked or even regularly smokes marijuana to donate blood.
Also, while marijuana and alcohol will not disqualify you from giving blood, intravenous drug use at any point in your lifetime will disqualify you as will various other medical conditions and other assorted criteria. A helpful guide on donating blood which was put together by the Red Cross can be found here.