Those who take drugs intravenously (direct injection into the vein using a needle and syringe),are much more likely to acquire serious infections like?

Nicotine acts as a stimulant because it mimics the effect of ......... .

Identify the correct statements from the following:
$(i)$ With repeated use of drugs,the tolerance level of the receptors present in the body increases.
$(ii)$ Youngsters often use drugs repeatedly due to financial gains.
$(iii)$ Lack of proper guidance or counseling leads individuals to become addicts.
$(iv)$ Repeated use of alcohol leads to 'withdrawal syndrome'.

Smack and Crack are produced from

The concentrated resin obtained from the female flowers of the cannabis plant is:

Assertion : $Cannabis \text{ } sativa$ is a powerful anti-depressant.
Reason : Hashish and Marijuana are derived from it.