No drug is uniform.
That "skunk" stuff has 300 mg of THC, as opposed to 10 mg of THC. That's over THIRTY TIMES the amount of THC per joint.
There's a key difference between smoking 20 mg of THC per week (2 joints a week), and 600 mg (2 joints a week). And then, if the kids then smoke more often than even that, that's even more compounded; if there's a much higher "high", would the kids be more likely to smoke even more per week? I think that that's an interesting question.
There's a kid that I met here in Corpus that was a drug user (I suggested for him to go to a rehab center; he actually eventually took my advice, he claims). He would *snort* weed, but it wasn't weed; it was 1/2 weed, 1/2 cocaine (crack? I forget).
Not nice stuff, but not necessarily normal marijuana either.
I smoke minimum of 4 grams per day, I have cut back to around 3-3.5 grams of natural weed not the hydro weed. I love the relaxed feeling it gives me, but it does have lasting psychological effects on long term heavy users, trust me I know.
About the flashbacks, Yes marijuana can cause flashbacks, just like the taste of a favorite sweet will take you back to childhood, or a song will take you back some place special. The flashbacks aren't as severe as the LSD and chemical drugs, but are still there. For some people with underlying scitzophrenic issues or weak mental health, Mary jane can magnify the issue or mental problem.
And while there is a physical withdrawl symptom, like hanging for coffee, I believe that the Psychological dependence is harder to break.
All your friends smoke it, this is no longer fun but a habit, you feel insecure if you go out and don't have some etc etc etc.
One has to stimulate the mind with other activities in order for one to quit, just stopping is not enough, you constantly sit there thinking' that was a good movie, pack a cone, that was a great dinner, pack a cone...and so on.
Sorry for the rant it is 3:45am in Australia, time for another bong and then it's bedtime.