Smoking marijuana can be unhealthy as smoking cigarettes and

Medical marijuana is much healthier than cigarettes. Street weed is worse though. Marijuana is used on cancer patients to help reduce the spread of cancer through the body. I'm not sure if it helps with lung cancer, but I would assume not. Trust me, I have smoked for a couple of years, and it hasn't given me any bad effects.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.