TV airings in the USA are uncommon, only on Boomerang. Looney Tunes Golden Collection DVD sets provide limited choices and not many one-shot cartoons. Majority of the cartoons not on the GC, SS, or PC releases are unrestored.
TV-G for television airings, whereas NR (Not Rated) when they aired originally.
Pretty minimal, in many shorts the characters use guns, TNT, slapstick etc.
Hardly any, but in two cartoons, characters are seen reading parodies of Esquire, which was considered quite racy back upon the cartoons' release.
Drugs and Alcohol:
If you consider tobacco to be in this category, then, yes. Many characters including Rocky and Mugsy are often seen smoking from pipes. Also, in the famous 1955 short One Froggy Evening, in order to attract more customers, the man who finds the singing frog holds up a sign reading "FREE BEER". There are rare references to marijuana in the Spanish lyrics to the song Wikipedia:La Cucaracha sung by either Speedy Gonzales or Slowpoke Rodriguez.
Crude Humor or Comic Mischief:
This series was built on crude mischief. Characters experience so much of this that it even went so far as to have Porky Pig be hit with a WB shield in the 1938 short Porky in Wackyland. In the earlier cartoons, racial stereotypes were used, as it was normal during the time, though this usage is less frequent in later cartoons.