You want to quit using Spice because of health risks? Okay, that's fine, but for a lot of people (and it sounds like you too), looming fears of how health *could* go bad isn't quite enough.
"I want to stop drinking so that my physical body doesn't turn to shit."
"Then why did you drink this morning?"
"Well...because I woke up feeling like utter shit!"
Drug/alcohol abuse trains people to think in the short-term. A drink, a joint, an injection, it's all instant gratification. Long-term consequences are often ignored, especially after that first drink has gone down (hell, after two or three we don't even care about that god-awful hangover tomorrow morning). Point being, a person used to living to maximize short-term conditions is not going to be that strongly motivated by things in the distant future - good or bad.
Instead of of thinking "if I drink, then [Bad Thing X] will happen down the road," try thinking "This [Good Thing Y] will be negatively affected by me using TODAY."
So instead of your using only possibly having a negative effect in your long-term, as long as you keep your life full of Good Things, using will rip apart these good things in the short-term.
Some of my good things are that I workout every morning and I read a good mystery novel in bed at night. If I got wasted right now, would I really (beyond superficially) care if it might help lead me to liver damage in twenty years? NO. But would it stop me from a good gym session in the morning? Yes! Would shooting some dope after work permanently collapse every single vein in my body? NO. Would I probably nod out and miss the last chapters of this weeks book? Ya.
Nobody likes worrying about their health, but I kinda do like working out and reading my cheesy novels. So as much as the goal is quitting your Drug of Choice, really it's also about coming up with interests, routines, little Good Things to fill your day with that you actually like doing and would not want to have interrupted. Seriously, pick anything, but boredom is the worst enemy for a lot of us TDSers.
Just drop the negative thinking - I cannot use because it will destroy my health. That's just like a sober person always thinking I can't go to the bar. I can't go to the casino. I can't go to the wedding. All this negative pressure leads to nowhere but trouble. Take a bottom-up approach, and build a life around you that has enough potential that there's no need to complicate it with either excessive worrying or drinking/drugging.
