Medical Marijuana: It's not JUST for 20s types.
I am a Medical Marijuana patient near San Francisco. I have been "certified" for the last 3 years.
When I get to one of the many Cannabis Buyers Clubs, I show my Med Pot ID, and then go inside. As I look around, I see many people in their 40s, 50s, 60s (and once a lady, 87 years young). Certainly, though, half of the customers are under 30.
I have seen some prices listed above, and I wonder where those people go to buy their "medicine." The TOP grades (like White Widow, exotic Kush, Diesel) go for no more than $55 an eighth (and less in some Clubs). A couple weeks ago I saw White Widow going for $40 (at an out-of-the-way Club).
Several Buyers Clubs have free-or-low-cost Medicine programs. You prove your income, then, each week you can receive several grams of Mid-grade.
And, for the adventure-seekers, most Clubs sell "clones" of some of the Hottest Strains on the market. For a few dollars, you can buy a 6-inch-high White Widow plant (some Clubs also sell 18-inch clones). No more fussing with trying to buy seeds from Amsterdam, and hoping that most of them will germinate. You buy a healthy plant, and just transplant it into your Garden.
Ouside of the Club scene, there are many Collectives, where members grow plants for other members, and only charge a little bit for their services. So, if the crop is bountiful, a person can get several ounces of High-grade Marijuana for $50 or so.
Having a Doctor's Recommendation is a pretty-good thing. For one thing, it keeps a Cop from arresting you if you happen to be holding less-than 8 ounces (I usually never have more than 2 oz on me). But another reason is: You are allowed to smoke Pot wherever it is legal to smoke a cigarette. This way, if I'm at my favorite park, I can smoke-away, free from the hassle of worrying about getting popped.