[Raak]It is explained in OneLook (halituous=like breath; vaporous) and the line is supposed to mean that you end up as smoke instead of reaching nirvana if you are stupid enough to use that drug (please also note the attemt to get a double rhyme with line 1).
[Marc] I believe the usual retort to "age before beauty" is "pearls before swine". :) Continuing from what I take is UK's second line of a limerick beginning with your last line... I must first get my coat
[Chalky] no, they are submitted just as examples of lines that should be banned from a serious site like this and any mature person writing such should be ashamed! ;-)
At the ‘Ladies’ as a standin’ Don Juan. [Chalky] You are right, but for sure he then would have been dead a long time ago, now (really: great great great great ..... grandson) there’s a chance he can still be at service ;-)