26. Which of the following is a physical risk of using alcohol and drugs? 1. Brain damage
2. Loss of interest in friends
3. Trouble communicating
4. Lack of concentration

1. Brain Damage

Explanation:

Usually these all make sense because it is what we observe, however, the last three are generally there before one even consumes drugs/alcohol for the first time. (it's also typically why they turn to substances.)

exercising at a moderate intensity, and slowly increasing the duration.