The with drawl symptoms would take affect in about 30 minutes after smoking or using it but talk to a doctor before you get this it can very much harm you.
The fear appeal is a common thing used in the media and basically boils down to trying to get someone do what you want them to do by providing them with an example that strikes fear if they wouldn't do that. A recent example would be Trump and his rhethoric about Mexicans and Muslims.
The state of being famous. This is the general definition.