All drug abusers had water, but not all water drinkers are drug abusers.
Most drug abusers started out with weed, and all weed abusers are drug abusers.
Maybe that doesn't make sense to you after smoking all that weed in your young years
Weed in itself isn't always more dangerous than alcohol or cigarettes even though it can, first time trying it without smoking more than you "should", cause a psychosis you may never recover from. Although unlikely the possibility exists. It's also commonly known to be a gateway drug to heavier drugs, something most recovered drug abusers can vouch for so I don't see why you weed liberals even try to defend weed in that aspect.
A major difference between weed and alcohol is that our body can handle a certain amount of alcohol without permanent damage even while young (teenager), while young weed smokers, according to studies (
source, and
source), risk irreversible damage to their intelligence, attention and memory. This has not been shown to the same extent by adults using any kind of cannabis based drug.
While smoking a little weed is in itself most of the time harmless, not everyone can handle it. Whether it's legal or not I couldn't care less about, knowing the possible effects is far more important.