You don't chew nicotine gum the way you chew normal gum. If you did, all the nicotine would be released directly into your saliva. If you swallowed the nicotine-soaked saliva, it would provoke a terrible stomachache and a nasty and overwhelming craving for a cigarette.
Meaning; SCRI: Salford Centre for Research and Innovation: SCRI: Sarah Cannon Research Institute: SCRI: Scottish Crops Research Institute
What is an SCR? (Extremely brief explanation)  An SCR is an acronym for Silicon Controlled Rectifier. It works similar to a typical diode, but is controlled similar to a bipolar transistor as far as connections go. Connection points are Anode [A], Cathode [K], and Gate [G].