I got more mail specifically about this strip than any other strip I've done so far, so I thought I'd give you damn drug fiends a little more information. Yes, you can trip on Mornging Glory seeds. Either chew a bunch up, about 100 equals a hit of acid like the cartoon says (make sure you wash off the coating specially designed to make you vomit if you eat them) or do it the hard way--Which is: Grind em in a coffee grinder. Soak the junk in grain alcohol for a few days (Grain alcohol is best because the alcohol will kill the nausea-producing effects of the morning glory seeds, although they're negligible to begin with. Water works too, or other alcoholic beverages, but the more alcohol, the less nausea). Drain the alcohol into a cup and drink it.
Opium seeds are sold K-Mart and it is in fact very easy to grow and produce, but it takes about a year to fruit. When it does, pull off the big seed pod and cut into it. Opium will seep out. Smoke it. You can also dry the seed pods and smoke that. In many larger cities they'll sell the dried pods at stores. And that's all there is to it. A great book about it is Opium For the Masses by Jim Hogshire, which tells much more and in greater detail than I ever could.